Difference between revisions of "Electrical Resistance"
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==Key Stage 3== | ==Key Stage 3== | ||
===Meaning=== | ===Meaning=== | ||
| − | '''Resistance''' is a description of how difficult it is to increase the [[Electrical Current|current]] through a [[Electrical Conductor|conductor]] when increasing the [[potential difference]]. | + | '''Resistance''' is a description of how difficult it is to increase the [[Electrical Current|current]] through a [[Electrical Conductor|conductor]] when increasing the [[Potential Difference|potential difference]]. |
===About Resistance=== | ===About Resistance=== | ||
Revision as of 17:45, 25 October 2018
Key Stage 3
Meaning
Resistance is a description of how difficult it is to increase the current through a conductor when increasing the potential difference.
About Resistance
- The unit of resistance is the Ohm (Ω).
- Resistance cannot be directly measured. Resistance must be calculated by dividing the Potential Difference by the Current.
- Conductors have a low resistance and insulators have a high resistance.
Equation
\[Resistance = \tfrac{Potential Difference}{Current}\] \[R = \tfrac{V}{I}\] Where:
- R = Resistance
- V = Potential Difference
- I = Current