Programme 19: Circuits

Answers to Activity Sheet 2

Resistance of Wire

1. [Insert 19/1 graph for wire A and B]

2. The wires obey Ohm’s Law because their graphs are straight lines through the origin.

3. B has the highest resistance (as it is the steepest line).

4. Resistance of A: R = 6.7 W
Resistance of B: R = 20 W

5. [ Insert 19/2 graph of non ohmic conductor]

6. No, it does not obey Ohm’s Law.

7. It could be a light bulb.