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Question
The relationship between the potential difference and the current in a conductor is stated in the form of a law.
1) Name the law.
2) What does the slope of V-I graph for a conductor represent?
3) Name the material used for making the connecting wire.
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Solution
1) The relationship between the potential difference and the current in a conductor is given by Ohm’s law.
2) The slope of the V–I graph gives the resistance of the conductor.
Slope = `V/I = R`
3) The material used for making connecting wires is copper.
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The voltage - current readings of a certain material are shown in the table given below:
| Voltage (V) | 10 V | 20 V | 30 V |
| Current (I) | 2 A | 3 A | 4 A |
Study the table.
- State whether the conductor used is ohmic or non-ohmic.
- Justify your answer.
- State Ohm's law.
