# On Ohm's Law

1. What is the meaning of the Ohm's Law when applied to the whole circuit and to a part of a circuit?

2. The resistance varies directly with potential difference. What should be the graph of potential difference versus resistance at constant current? How would you get the constant current out of the graph?

3. The relation between current and potential difference if the resistance is constant is that they vary directly proportional to each other. What is the graph of potential difference and current at constant resistance?

4. The current is inversely proportional to the resistance at constant voltage. What is the graph of current versus the resistance at constant voltage, line sloping downward or parabolic downward? How would you determine the value of the constant voltage from the graph "I v.s. 1/R"?

5. If Ohm's Law is not obeyed by a certain nonlinear conductor, how do we measure its resistance?

6. Why is a person more likely to get electric shock when he plugs in an appliance to the wall socket with wet hands?

7. An electronic device has a resistance which varies directly as the potential difference across it. How does the current through the device vary with the potential difference?

8. A constant potential difference of 1.5V is established between the ends of a nichrome wire and the current through it is measured at each of the following lengths:

Length (m) Current (A)
1.......... 4.71
2.......... 2.36
3.......... 1.57
4.......... 1.18
5.......... 0.94

If nichrome is a linear conductor, how does the resistance of nichrome vary with the length?

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