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# Electricity Formula

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Electricity Formula

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### Electricity Formula

1. 1. CURRENT :<br />The rate of flow of electric charge measured in amperes.<br />A<br />Where…<br /><ul><li>I is current. (A)
2. 2. Q is electric charge. (c)
3. 3. T is time. (s)</li></ul>Measured by connecting an Ammeter in series to the electrical circuit.<br />
4. 4. VOLTAGE :<br />Potential Difference (p.d.)Electromotive Force (e.m.f.)<br />V<br />Where…<br /><ul><li> V is p.d. or e.m.f. (V)
5. 5. E is energy. (J)
6. 6. W is work done. (J)
7. 7. Q is electric charge. (c)</li></ul>Measured by connecting an Voltmeter in parallel to an electrical circuit.<br />
8. 8. Resistance :<br />The ratio of the p.d. across the component to the current flowing through it.<br />Where…<br /><ul><li>R is Resistance. (Ω)
9. 9. ρ is Resistivity. (Ω m)
10. 10. l is time. (m)
11. 11. A is area. (m2)</li></ul>Increased by connecting a resistor in to the electrical circuit.<br />
12. 12. Resistance :<br />The ratio of the p.d. across the component to the current flowing through it.<br />Where…<br /><ul><li>R is Resistance. (Ω)
13. 13. V is p.d. or e.m.f.. (V)
14. 14. l is Current. (A)</li></ul>Increased by connecting a resistor in to the electrical circuit.<br />
15. 15. POWER :<br />The rate at which energy is released.<br />Where…<br /><ul><li> P is Power. (W)
16. 16. V is p.d. or e.m.f.. (V)
17. 17. l is Current. (A)</li>