Questions where students often pick the tempting wrong answer — make sure you know the right one:
What happens to the total resistance when you add another resistor in parallel?✗ Adding any resistor always increases the total resistance.✓ Total resistance decreases — there are more paths for current to flow.
What happens to the current as it goes around a series circuit?✗ Current gets used up by each component as it flows around the circuit.✓ It stays the same at every point — current is conserved.
What does voltage (potential difference) across a component represent?✗ Voltage is the 'amount of electricity' flowing through the wire.✓ The energy transferred per unit charge passing through that component.
The I-V graph of a filament lamp is a curve that flattens out. Why?✗ The diode blocks reverse current✓ Its resistance increases as it heats up
Which instrument measures current, and how is it connected?✗ Voltmeter, in parallel✓ Ammeter, in series
Practise Electricity — free games
Test yourself with these quick revision games for this topic:
