1
Q
What happens to current as resistance increases?
A
It decreases
2
Q
What happens to a bulb or motor in a circuit if there is more current?
A
It will be brighter or spin faster.
3
Q
How does a variable resistor work?
A
Makes the wire longer to increase the resistance.
4
Q
What does a resistor obey?
A
Ohm’s law
5
Q
What does a voltage-current graph show for a fixed resistor?
A
- Voltage is directly proportional to current
- The steeper the gradient the higher the resistance
6
Q
Why does a bulb not obey Ohm’s law?
A
The gradient of the line increases as the current increases.
Physics P6
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