Question
Electric current and Potential difference
| Electric current | Potential difference |
| (i) The flow of electric charge per unit time is called electric current. | (i) The difference in potential between the positive and negative terminal of a cell is the potential difference of that cell. |
| (ii) The S.I. unit of electric current is ampere. | (ii) The S.I. unit of potential difference volt. |
| (iii) Ammeter is used to measure electric current. | (iii) Voltmeter is used to measure electric current. |
| (iv) Current is represented by: $\mathrm{I}=\frac{\mathrm{Q}}{\mathrm{t}}$ | (iv) Potential difference is represented by: $\mathrm{V}=\frac{\mathrm{W}}{\mathrm{Q}}$ |
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