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DP IB Physics: SL

Topic Questions

Home / IB / Physics: SL / DP / Topic Questions / 5. Electricity & Magnetism / 5.2 Heating Effect of Electric Currents / Multiple Choice


5.2 Heating Effect of Electric Currents

Question 1

Marks: 1

A circuit contains five identical resistors and four identical voltmeters. The reading on voltmeter V1 is 8.0 V and the reading on voltmeter V2 is 1.0 V. What are the readings on V3 and V4?q11_heating-effect-of-electric-currents_ib-sl-physics-mcq

 

reading on voltmeter V3 / V

reading on voltmeter V4 / V

A.

1.5

1.0

B.

3.0

2.0

C.

4.5

3.0

D.

6.0

4.0

    Choose your answer
      

    Question 2

    Marks: 1

    A power cable X has resistance R and carries current I. A second cable Y has resistance 2R and carries current 1 half.

    What is the ratio fraction numerator p o w e r blank d i s s i p a t e d blank i n blank bold italic Y over denominator p o w e r blank d i s s i p a t e d blank i n blank bold italic X end fraction?

    • 1 fourth

    • 1 half

    • 2

    • 4

    Choose your answer
      
    Key Concepts
    Power Dissipation

    Question 3

    Marks: 1

    Two resistors are connected to a cell.

     

    q14_heating-effect-of-electric-currents_ib-sl-physics-mcq

     

    Assuming both resistors are made from wires of the same length, which graph shows how the potential V varies along the line XY?

    ma14_heating-effect-of-electric-currents_ib-sl-physics-mcq

      Choose your answer
        
      Key Concepts
      Ohm’s Law

      Question 4

      Marks: 1

      Kirchhoff’s laws are applied to the circuit shown.

       q15_heating-effect-of-electric-currents_ib-sl-physics-mcq

      What is the equation for the dotted loop?

      • 0 = 2I3 – 3I2

      • 0 = 2I2 – 3I3

      • 6 = 3I2 + 2I3 + 2I1 

      • 6 = 3I2 + 2I3 

      Choose your answer
        

      Question 5

      Marks: 1

      In the circuit shown, the fixed resistor has a value of 3 Ω and the variable resistor varies between 0 Ω and 12 Ω.

      q16_heating-effect-of-electric-currents_ib-sl-physics-mcq

      The power supply has an emf of 15 V and negligible internal resistance.

      What is the range of potential differences V which can be measured across the 3 Ω resistor?

      • 3 V

      • 6 V

      • 9 V

      • 12 V

      Choose your answer
        

      Question 6

      Marks: 1

      Four resistors are connected to a battery of e.m.f. 6 V as shown.

       

      q17_heating-effect-of-electric-currents_ib-sl-physics-mcq

       

      If the battery has negligible internal resistance, what is the current in the battery?

      • 2 A

      • 3 A

      • 4 A

      • 5 A

      Choose your answer
        

      Question 7

      Marks: 1

      Which of the following cannot be the units for resistivity?

      • V m A–1

      • J m s–1 A–1

      • J m s–1 A–2

      • Ω m

      Choose your answer
        
      Key Concepts
      Resistivity

      Question 8

      Marks: 1

      Three resistors are connected to a cell of e.m.f. 10 V and negligible internal resistance as shown.

      q19_heating-effect-of-electric-currents_ib-sl-physics-mcq

      What is the power dissipated in one of the 2 Ω resistors and in the whole circuit?

       

      power dissipated in the 2 Ω resistor / W

      power dissipated in the whole circuit / W

      A

      1

      18

      B

      1

      20

      C

      2

      18

      D

      2

      20

        Choose your answer
          

        Question 9

        Marks: 1

        Three identical lamps, W, X and Y are connected to a cell of negligible internal resistance as shown.

         

        q20_heating-effect-of-electric-currents_ib-sl-physics-mcq

        When the switch is closed, each lamp is lit. Which of the following correctly describes the brightness of lamps W, X and Y when the switch is opened?

         

        lamp W

        lamp X

        lamp Y

        A

        increases

        increases

        decreases

        B

        decreases

        off

        decreases

        C

        decreases

        off

        increases

        D

        increases

        decreases

        decreases

          Choose your answer
            

          Question 10

          Marks: 1

          A science student who lives in the UK, where the mains voltage is 240 V, buys a light bulb marked 60 W which she uses in her bedroom. The student takes the lightbulb with her on a trip to Canada where the mains voltage is 100 V and also uses it there.

          Which line correctly identifies the approximate power dissipated in the bulb in the UK and Canada?

            UK / W Canada / W
          A. 30 10
          B. 60 30
          C. 60 10
          D. 120 60
          Choose your answer