| Date | November 2020 | Marks available | 1 | Reference code | 20N.1.HL.TZ0.18 |
| Level | Higher level | Paper | Paper 1 | Time zone | 0 - no time zone |
| Command term | Question number | 18 | Adapted from | N/A |
Question
An electrical power supply has an internal resistance. It supplies a direct current I to an external circuit for a time t. What is the electromotive force (emf) of the power supply?
A. total energy transferred to the whole circuitI×t
B. total power transferred to the whole circuitI×t
C. total energy transferred to the external circuitI×t
D. total power transferred to the external circuitI×t
Markscheme
A
Examiners report
Syllabus sections
- 22M.2.SL.TZ2.4b.i: State the emf of the cell.
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22M.2.SL.TZ2.4b.ii:
Deduce the internal resistance of the cell.
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22M.2.HL.TZ2.4c.ii:
Comment on the implications of your answer to (c)(i) for cell B.
- 22M.2.HL.TZ2.4b.i: State the emf of the cell.
-
22M.2.HL.TZ2.4b.ii:
Deduce the internal resistance of the cell.
- 17N.3.SL.TZ0.2b: State the value of the intercept on the R axis.
- 17M.2.SL.TZ1.5b.i: Explain which interaction is responsible for this decay.
- 21N.1.HL.TZ0.17: A cell has an emf of 3.0 V and an internal resistance of 2.0 Ω. The cell is connected in...
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18M.1.HL.TZ1.17:
When an electric cell of negligible internal resistance is connected to a resistor of resistance 4R, the power dissipated in the resistor is P.
What is the power dissipated in a resistor of resistance value R when it is connected to the same cell?
A. P4
B. P
C. 4P
D. 16P
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17M.3.SL.TZ2.2b:
In one experiment a student obtains the following graph showing the variation with current I of the potential difference V across the cell.
Using the graph, determine the best estimate of the internal resistance of the cell.
- 17M.1.SL.TZ1.15: Two pulses are travelling towards each other. What is a possible pulse shape when the...
- 19N.1.SL.TZ0.19: The diagram shows a resistor network. The potential difference between X and Y is 8.0...
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19M.2.SL.TZ1.1d:
Determine the internal resistance of the battery.
- 19M.3.SL.TZ2.1c: Outline, without calculation, how the internal resistance can be determined from this graph.
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18M.2.HL.TZ2.4a:
State what is meant by the emf of a cell.
- 21N.1.SL.TZ0.21: A variable resistor is connected in series to a cell with internal resistance r as...
- 17N.1.SL.TZ0.19: With reference to internal energy conversion and ability to be recharged, what are...
- 16N.1.HL.TZ0.17: A 12V battery has an internal resistance of 2.0Ω. A load of variable resistance is connected...
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19M.2.SL.TZ1.1e.i:
Calculate the emf of one cell.
- 18M.1.SL.TZ2.22: A cell has an emf of 4.0 V and an internal resistance of 2.0 Ω. The ideal voltmeter reads 3.2...
- 19M.2.HL.TZ2.4bi: The switch is now closed. State, without calculation, why the current in the cell will increase.
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17N.3.SL.TZ0.2a:
Show that the gradient of the graph is equal to 1e.
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21M.2.SL.TZ2.6a:
Explain why the output potential difference to the external circuit and the output emf of the photovoltaic cell are different.
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21M.1.SL.TZ2.21:
Three identical resistors of resistance R are connected as shown to a battery with a potential difference of 12 V and an internal resistance of R2. A voltmeter is connected across one of the resistors.
What is the reading on the voltmeter?
A. 3 V
B. 4 V
C. 6 V
D. 8 V
- 21M.1.SL.TZ1.20: For a real cell in a circuit, the terminal potential difference is at its closest to the emf...
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18M.2.SL.TZ2.4a:
State what is meant by the emf of a cell.
- 18M.1.SL.TZ1.20: Five resistors of equal resistance are connected to a cell as shown. ...
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19M.2.HL.TZ2.4a:
The switch S is initially open. Calculate the total power dissipated in the circuit.
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19M.2.HL.TZ2.4bii:
The switch is now closed. Deduce the ratio power dissipated in Y with S openpower dissipated in Y with S closed.
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21M.2.SL.TZ2.6b:
Calculate the internal resistance of the photovoltaic cell for the maximum intensity condition using the model for the cell.
