DP Physics Questionbank

Description

Nature of science:
Peer review: Although Ohm and Barlow published their findings on the nature of electric current around the same time, little credence was given to Ohm. Barlow’s incorrect law was not initially criticized or investigated further. This is a reflection of the nature of academia of the time with physics in Germany being largely non-mathematical and Barlow held in high respect in England. It indicates the need for the publication and peer review of research findings in recognized scientific journals. (4.4)

Understandings:

• Circuit diagrams
• Kirchhoff’s circuit laws
• Heating effect of current and its consequences
• Resistance expressed as 
• Ohm’s law
• Resistivity
• Power dissipation

Applications and skills:

• Drawing and interpreting circuit diagrams
• Identifying ohmic and non-ohmic conductors through a consideration of the V/Icharacteristic graph
• Solving problems involving potential difference, current, charge, Kirchhoff’s circuit laws, power, resistance and resistivity
• Investigating combinations of resistors in parallel and series circuits
• Describing ideal and non-ideal ammeters and voltmeters
• Describing practical uses of potential divider circuits, including the advantages of a potential divider over a series resistor in controlling a simple circuit
• Investigating one or more of the factors that affect resistance experimentally

Guidance:

• The filament lamp should be described as a non-ohmic device; a metal wire at a constant temperature is an ohmic device
• The use of non-ideal voltmeters is confined to voltmeters with a constant but finite resistance
• The use of non-ideal ammeters is confined to ammeters with a constant but non-zero resistance
• Application of Kirchhoff’s circuit laws will be limited to circuits with a maximum number of two source-carrying loops

Data book reference:

International-mindedness:

• A set of universal symbols is needed so that physicists in different cultures can readily communicate ideas in science and engineering

Theory of knowledge:

• Sense perception in early electrical investigations was key to classifying the effect of various power sources; however, this is fraught with possible irreversible consequences for the scientists involved. Can we still ethically and safely use sense perception in science research?

Utilization:

• Although there are nearly limitless ways that we use electrical circuits, heating and lighting are two of the most widespread
• Sensitive devices can employ detectors capable of measuring small variations in potential difference and/or current, requiring carefully planned circuits and high precision components

Aims:

• Aim 2: electrical theory and its approach to macro and micro effects characterizes much of the physical approach taken in the analysis of the universe
• Aim 3: electrical techniques, both practical and theoretical, provide a relatively simple opportunity for students to develop a feeling for the arguments of physics
• Aim 6: experiments could include (but are not limited to): use of a hot-wire ammeter as an historically important device; comparison of resistivity of a variety of conductors such as a wire at constant temperature, a filament lamp, or a graphite pencil; determination of thickness of a pencil mark on paper; investigation of ohmic and non-ohmic conductor characteristics; using a resistive wire wound and taped around the reservoir of a thermometer to relate wire resistance to current in the wire and temperature of wire
• Aim 7: there are many software and online options for constructing simple and complex circuits quickly to investigate the effect of using different components within a circuit

Directly related questions

• 18M.2.SL.TZ2.4b.ii: Determine E.
• 18M.2.SL.TZ2.4b.i: Show that the resistance of the wire AC is 28 Ω.
• 18M.2.HL.TZ2.4c: Cell X is replaced by a second cell of identical emf E but with internal resistance 2.0...
• 18M.1.SL.TZ2.19: A cell with negligible internal resistance is connected as shown. The ammeter and the...
• 18M.1.HL.TZ2.16: A cell of emf 6.0 V and negligible internal resistance is connected to three resistors as...
• 18M.2.SL.TZ1.4a: Calculate the resistance of the conductor.
• 18M.1.SL.TZ1.21: Two resistors X and Y are made of uniform cylinders of the same material. X and Y are connected...
• 18M.1.SL.TZ1.18: Three resistors are connected as shown. What is the value of the total resistance between X and...
• 17N.2.SL.TZ0.3c: Draw a circuit diagram to show how you could measure the resistance of the carbon-film resistor...
• 17N.2.SL.TZ0.3b: The current direction is now changed so that charge flows vertically through the film. Deduce,...
• 17N.2.SL.TZ0.3a.iii: State why knowledge of quantities such as resistivity is useful to scientists.
• 17N.2.SL.TZ0.3a.ii: The film must dissipate a power less than 1500 W from each square metre of its surface to avoid...
• 17N.2.SL.TZ0.3a.i: The resistance of the carbon film is 82 Ω. The resistivity of carbon is 4.1 x 10–5 Ω m. Calculate...
• 17N.1.SL.TZ0.18: Kirchhoff’s laws are applied to the circuit shown. What is the equation for the dotted...
• 17N.1.SL.TZ0.17: In the circuit shown, the fixed resistor has a value of 3 Ω and the variable resistor can be...
• 17M.3.SL.TZ2.2a: An ammeter and a voltmeter are connected in the circuit. Label the ammeter with the letter A and...
• 17M.2.HL.TZ2.6b.iii: Determine the power dissipated in the cable per unit length.
• 17M.2.HL.TZ2.6b.ii: Calculate the peak current in the cable.
• 17M.2.HL.TZ2.6b.i: Calculate the radius of each wire.
• 17M.2.HL.TZ1.4a.iii: Calculate the power dissipated in the cable.
• 17M.2.SL.TZ2.5b.ii: There is a current of 730 A in the cable. Show that the power loss in 1 m of the cable is about...
• 17M.2.SL.TZ1.4c: The heater changes the temperature of the water by 35 K. The specific heat capacity of water is...
• 17M.2.SL.TZ1.4b: Explain, in terms of electrons, what happens to the resistance of the cable as the temperature of...
• 17M.2.SL.TZ1.4a.ii: Calculate the resistance of the cable.
• 17M.2.SL.TZ1.4a.i: Calculate the current in the copper cable.
• 17M.1.SL.TZ2.20: A circuit contains a cell of electromotive force (emf) 9.0 V and internal resistance 1.0 Ω...
• 17M.1.SL.TZ1.15: Two pulses are travelling towards each other. What is a possible pulse shape when the pulses...
• 16N.2.SL.TZ0.7b: Components R and T are placed in a circuit. Both meters are ideal. Slider Z of the...
• 16N.2.SL.TZ0.7a: (i) State how the resistance of T varies with the current going through T. (ii) Deduce, without...
• 16M.2.HL.TZ0.6a: Two cells of negligible internal resistance are connected in a circuit. The top cell has...
• 16M.2.SL.TZ0.5a: State what is meant by an ideal voltmeter.
• 16M.2.SL.TZ0.1e: The electric motor is connected to a source of potential difference 120V and draws a current of...
• 16N.1.SL.TZ0.20: A cell of emf 4V and negligible internal resistance is connected to three resistors as shown. Two...
• 16N.1.SL.TZ0.19: An electrical circuit is shown with loop X and junction Y. What is the correct expression of...
• 16M.1.HL.TZ0.12: A circuit consists of a cell of electromotive force (emf) 6.0V and negligible...
• 16M.1.SL.TZ0.20: A circuit consists of a cell of electromotive force (emf) 6.0V and negligible internal resistance...
• 16M.1.SL.TZ0.19: The graph shows the variation of current I in a device with potential difference V across...
• 15M.1.SL.TZ2.18: The diagram shows a circuit used to investigate internal resistance of a cell. The variable...
• 15M.1.SL.TZ1.18: Four resistors are connected as shown. What is the total resistance between X and Y? A. 3 Ω B....
• 15M.1.HL.TZ2.17: The diagram shows an electric circuit containing a potentiometer of maximum resistance R. The...
• 15M.2.SL.TZ2.5f: An electric circuit consists of a supply connected to a 24Ω resistor in parallel with a variable...
• 15M.2.HL.TZ2.9a: A 24Ω resistor is made from a conducting wire. (i) The diameter of the wire is 0.30 mm and the...
• 15M.2.HL.TZ2.9b: An electric circuit consists of a supply connected to a 24Ω resistor in parallel with a variable...
• 14M.1.SL.TZ1.16: Each of the resistors in the arrangements below has resistance R. Each arrangement is connected,...
• 14M.1.SL.TZ1.17: Two resistors of resistance 10 Ω and 20 Ω are connected in parallel to a cell of negligible...
• 14M.1.SL.TZ1.18: A battery of emf 12 V and negligible internal resistance is connected to a resistor of constant...
• 14M.1.SL.TZ2.17: Which of the following is a statement of Ohm’s law? A. The resistance of a conductor is...
• 14M.1.SL.TZ2.18: Three identical filament lamps W, X and Y are connected in the circuit as shown. The cell has...
• 15N.1.HL.TZ0.18: A filament lamp and a semiconducting diode have the voltage–current (\(V\)–\(I\)) characteristics...
• 15N.2.HL.TZ0.8f.ii: Calculate the power supplied to the transformer.
• 15N.1.SL.TZ0.20: Three resistors of resistance \(R\) are connected in parallel across a cell of electromotive...
• 15N.2.HL.TZ0.8f.i: Calculate the current in the cables connected to the town
• 15N.2.HL.TZ0.8f.iii: Determine the input voltage to the transformer if the power loss in the cables from the power...
• 15N.1.SL.TZ0.19: A cylindrical resistor of length \(l\) is made from a metal of mass \(m\). It has a resistance...
• 15N.2.HL.TZ0.9g.ii: Each cubic metre of the wire contains approximately \(8.5 \times {10^{28}}\) free electrons. The...
• 14N.1.SL.TZ0.16: A cylindrical resistor of volume V and length l has resistance R. The resistor has a uniform...
• 15N.2.SL.TZ0.6d: An ammeter and a voltmeter are used to investigate the characteristics of a variable resistor of...
• 15N.2.SL.TZ0.6e: Show that the current in the circuit is approximately 0.70 A when \(R = 0.80{\text{ }}\Omega \).
• 14N.1.SL.TZ0.18: A lamp is connected to an electric cell and it lights at its working voltage. The lamp is then...
• 14N.1.HL.TZ0.19: A voltmeter of resistance 50kΩ is used to measure the electric potential difference in a circuit,...
• 14N.1.HL.TZ0.18: A lamp is connected to an electric cell and it lights at its working voltage. The lamp is then...
• 14N.2.HL.TZ0.8d.i: On the graph, sketch the variation of \(V\) with \(I\) for the cell.
• 14N.2.HL.TZ0.8d.ii: Using the graph, determine the current in the circuit.
• 14N.2.SL.TZ0.2b.i: Draw on the diagram the positions of the ammeter and voltmeter.
• 14N.2.SL.TZ0.2b.ii: Show that the emf of the cell is 1.25 V.
• 14N.2.SL.TZ0.2b.iv: Calculate the energy dissipated per second in the variable resistor.
• 11N.1.SL.TZO.16: A cell is connected in series with a 2.0Ω resistor and a switch. The voltmeter is connected...
• 11N.1.HL.TZ0.21: A resistor has a resistance R. The potential difference across the resistor is V. Which of the...
• 12N.1.SL.TZ0.19: An ideal ammeter is used to measure the current in a resistor. Which of the following gives the...
• 12N.1.HL.TZ0.20: An ideal ammeter is used to measure the current in a resistor. Which of the following gives the...
• 13N.1.SL.TZ0.17: A resistor X of resistance R is made of wire of length L and cross-sectional area A. Resistor Y...
• 13N.1.SL.TZ0.19: Each of the resistors in the circuit has a resistance of 2.0 Ω. The cell has an emf of 3.0 V and...
• 12M.1.SL.TZ2.16: A metal wire X with length L and radius r has a resistance R. A wire Y of length 4L made from...
• 13M.2.SL.TZ1.8d: The diagram shows 12 photovoltaic cells connected in series and in parallel to form a module to...
• 12M.1.SL.TZ2.17: Three identical filament lamps, X, Y and Z, are connected as shown to a battery of...
• 12M.1.SL.TZ2.18: Which of the following is the correct way of connecting an ammeter and of connecting a voltmeter...
• 12M.1.SL.TZ1.18: Which of the following gives the resistances of an ideal ammeter and an ideal voltmeter?
• 11M.1.SL.TZ2.17: The graph shows the I–V characteristics of two resistors.   When resistors X and Y are...
• 11M.1.HL.TZ2.20: Two resistors, of resistance R1 and R2,...
• 13M.1.SL.TZ2.16: A copper wire with length L and radius r has a resistance R. What is the radius of a copper wire...
• 13M.1.SL.TZ2.17: An electric circuit consists of three identical resistors of resistance R connected to a cell of...
• 13M.1.SL.TZ2.18: A proton is accelerated from rest through a potential difference of 1000 V. What is the potential...
• 13M.1.HL.TZ2.20: A copper wire with length L and radius r has a resistance R. What is the radius of a copper wire...
• 12M.2.SL.TZ2.7b: The plates in (a) are replaced by a cell that has an emf of 12.0 V and internal resistance 5.00...
• 11M.2.SL.TZ2.9a: ...
• 11M.2.SL.TZ2.9b: ...
• 12M.2.SL.TZ1.9b: (i) Calculate the resistance of the filament lamp when the potential difference across it is 2.8...
• 12M.2.SL.TZ1.9c: Two identical filament lamps are connected in series with a cell of emf 6.0 V and negligible...
• 11N.2.SL.TZ0.2b: A tungsten filament lamp is marked 6.0 V, 15 W. (i) Show that the resistance of the lamp at its...
• 11N.2.HL.TZ0.10d: (d) The diagram shows part of a potential divider circuit used to measure the current-potential...
• 11N.2.SL.TZ0.2c: The diagram shows part of a potential divider circuit used to measure the current-potential...
• 11N.2.SL.TZ0.9b: The electric motor can be adjusted such that, after an initial acceleration, the load moves at...
• 11N.2.HL.TZ0.10e: A student sets up a different circuit to measure the I–V graph. The cell has an emf of 6.0 V and...
• 13N.2.SL.TZ0.5d: Outline, with reference to the graph and to Ohm’s law, whether or not each component is ohmic.
• 13N.2.SL.TZ0.5e: Components X and Y are connected in parallel. The parallel combination is then connected in...
• 11M.2.SL.TZ1.8b: A battery of emf ε and negligible internal resistance is connected in series to two...
• 11M.2.SL.TZ1.8c: The graph shows the I-V characteristics of two conductors, X and Y. On the axes below, sketch...
• 11M.2.SL.TZ1.8d: The conductors in (c) are connected in series to a battery of emf ε and negligible...
• 11M.2.SL.TZ1.8a: Define (i) electromotive force (emf ) of a battery. (ii) electrical resistance of a conductor.  
• 09M.1.SL.TZ1.17: Two \(6{\text{ }}\Omega \) resistors are connected in series with a 6 V cell. A student...
• 09M.1.SL.TZ1.16: Two rectangular blocks, \(X\) and \(Y\), of the same material have different dimensions but the...
• 09N.1.SL.TZ0.17: A cylindrical conductor of length \(l\), diameter \(D\) and resistivity \(\rho \) has resistance...
• 09N.1.SL.TZ0.18: In the circuits below the cells have the same emf and zero internal resistance. The resistors all...
• 10M.1.SL.TZ1.17: A resistor of resistance \({\text{12 }}\Omega \) is connected in series with a cell of negligible...
• 10N.1.SL.TZ0.17: The circuit shows a resistor R connected in series with a battery and a resistor of resistance...
• 10N.1.SL.TZ0.18: Three identical resistors are connected to a battery as shown. Which of the following is a...
• 10N.1.SL.TZ0.16: Two resistors, made of the same material, are connected in series to a battery. The length of...
• 10N.2.SL.TZ0.A3a: Draw the complete diagram of the circuit that uses a potential divider, ammeter, voltmeter and...
• 10N.2.SL.TZ0.A3b: The graph shows the current-voltage characteristics for the component X. Component X is now...