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4.2 Electrical quantities

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Question 48

A circuit contains a variable resistor connected to a variable power supply.

The table shows the currents for different values of the potential difference (p.d.) and the resistance:

p.d. / Vresistance / Ωcurrent4.08I112.08I24.04I3 \begin{array}{|c|c|c|} \hline \text{p.d. / V} & \text{resistance / } \Omega & \text{current} \\ \hline 4.0 & 8 & I_1 \\ \hline 12.0 & 8 & I_2 \\ \hline 4.0 & 4 & I_3 \\ \hline \end{array} p.d. / V4.012.04.0​resistance / Ω884​currentI1​I2​I3​​​

What is the order of the currents from smallest to largest?

A

I1→I2→I3I_1 \rightarrow I_2 \rightarrow I_3I1​→I2​→I3​

B

I1→I3→I2I_1 \rightarrow I_3 \rightarrow I_2I1​→I3​→I2​

C

I2→I1→I3I_2 \rightarrow I_1 \rightarrow I_3I2​→I1​→I3​

D

I3→I1→I2I_3 \rightarrow I_1 \rightarrow I_2I3​→I1​→I2​

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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