AQA
A Level
A Level Physics
ELECTRICAL CIRCUITS: Electrical
Quantities (Answers)
2022
Total Marks:/30
, 1. This question is about the variation of quantities such as current, voltage and resistance in simple
electrical circuits containing a variety of standard components.
Total for Question 1: 11
Figure 1: I-V characteristics for three different circuit components.
(a) State Ohm’s Law. [1]
Solution: I ∝ V [3]
(b) Assign one of the following components to each of the characteristic graphs in Figure 1: filament
lamp, semiconductor diode, resistor.
Solution:
1: resistor
2: filament lamp
3: diode
(c) Why have these been plotted on graphs of current against potential difference rather than current [1]
against electromotive force?
Solution: EMF is concerned with energy being put into the circuit; PD is concerned with
energy used by components.
(d) For the diode, state the value of the resistance when a backward bias is applied. [1]
Solution: Zero
A Level
A Level Physics
ELECTRICAL CIRCUITS: Electrical
Quantities (Answers)
2022
Total Marks:/30
, 1. This question is about the variation of quantities such as current, voltage and resistance in simple
electrical circuits containing a variety of standard components.
Total for Question 1: 11
Figure 1: I-V characteristics for three different circuit components.
(a) State Ohm’s Law. [1]
Solution: I ∝ V [3]
(b) Assign one of the following components to each of the characteristic graphs in Figure 1: filament
lamp, semiconductor diode, resistor.
Solution:
1: resistor
2: filament lamp
3: diode
(c) Why have these been plotted on graphs of current against potential difference rather than current [1]
against electromotive force?
Solution: EMF is concerned with energy being put into the circuit; PD is concerned with
energy used by components.
(d) For the diode, state the value of the resistance when a backward bias is applied. [1]
Solution: Zero
