GCSE Standard Questions: Electricity in the Home
Q7. (a) Complete the sentence:
The current through an ohmic conductor is directly proportional to the _ _ _ _ _ _ _ across the component, provided that the _ _ _ _ _ _ _ remains constant.
(b) The graph shows a 'current – potential difference' graph for a filament lamp.
Explain how the resistance of a filament lamp changes as the potential difference across it increases.
(c) Many householders are replacing their filament lamps with LED lamps which are more energy efficient. What does more energy efficient mean?
(d) A Light Dependent Resistor (LDR) is used to turn on an outside lamp when it gets dark.
Part of the circuit is shown below:
(Total 14 marks)