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NUE 052 - Resistance, Ohms Law & Power Dissipation |
| Resistance is the opposition to current flow in a conductor, measured in Ohms. The symbol is R. | |
| A good conductor such as copper has a low resistance. A good insulator such as mica has a high resistance. | |
| Ohms law is named after Georg Simon Ohm who presented his laws back in 1827. In his honour the unit of electrical resistance was named the 'ohm' . Ohms law relates voltage, current and resistance. | |
| Power is the rate that energy is used or dissipated, measured in Watts. The symbol is P. | |
Use Ohms law to find a value - cover ONE symbol in the triangle to solve the formula |
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| Volts (V), Amps (I) & Ohms (R) | Watts (P), Volts (V) & Amps (I) |
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| You can download an Ohms law calculator here for a bit of fun (204 kb download) | ||||||||||||||||||||||||
| Practice Tests | Practice tests are available on the Practice Test page |
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