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Energy and Electricity

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Potential Difference: the difference in electrical potential between two points

• measured using a voltmeter
• has to be in a parralel circuit to whatever is being measured. As it offers too much resistance.

Power = voltage x current

power = work done/time taken

Electrical Resistnce: how much a componant resists the current

• V=IR
• Volts=current x resistance
• resistance is measured in ohms

Resistance in a series circuit

• can be treated as one resistor
•  R_T= R₁+ R₂

Resistance in a parallel

• two resistors are treated as one
•  1/R_T= 1/R₁+ 1/R₂
• when you get a fraction, divide numerator by denominator

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by: Admin
Total views: 4503
Word Count: 291
Date: Mon, 22 May 2006 Time: 12:00 AM
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