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4.2 Electrical quantities

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Question 3

A resistor of resistance R R\,R is connected to a power supply that maintains a potential difference V V\,V across it.

There is a current I I\,I in the resistor, and a charge Q Q\,Q passes through it in a time interval ttt.

During this time, the electrical energy transferred to thermal energy in the resistor is EEE.

Which expression is correct?

A

E=I2RtE = I^2 R tE=I2Rt

B

E=V2tIE = \frac{V^2 t}{I}E=IV2t​

C

Q=VRtQ = \frac{V}{R t}Q=RtV​

D

R=VQtR = \frac{V}{Q t}R=QtV​

Markscheme

4.2 Electrical quantities Questions

  1. IGCSE
  2. /Physics
  3. /4.2 Electrical quantities

452 exam-style questions on CIE IGCSE Physics 4.2 Electrical quantities, covering 4.2.1a Positive and negative charge, 4.2.1b Charging by friction and detecting charge, 4.2.1c Electrical conductors and insulators, 4.2.1d Electric fields and electric field patterns, 4.2.2a Electric current, charge and measuring current, 4.2.2b Conduction in metals and the direction of current, 4.2.2c Direct current and alternating current, 4.2.3a Electromotive force, 4.2.3b Potential difference and voltmeters, 4.2.4a Resistance, 4.2.4b Resistance of a metallic wire, 4.2.4c Current–voltage graphs, and 4.2.5 Electrical energy and electrical power. Each one has a worked solution and a mark scheme showing where the marks go.

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