A resistor has a straight line graph which passes through the origin. This is a directly proportional relationship. The straight line shows that resistance is constant.

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Lamp/bulb

The straight line region shows where resistance is constant. As the temperature of the bulb increases, the resistance increases. The increase in resistance is shown by the curve.

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Diode

A diode has a very high resistance for low and negative potential differences. This means that no current can flow. Above a certain value the resistance rapidly decreases and the current rapidly increases.

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Charge Equation:

...

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Charge = ?

Charge = current x time

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Charge, Symbol and Unit

Symbol = Q Unit = Coulombs, C

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Current, Symbol and Unit

Symbol = I Unit = Amps, A

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Time, Symbol and Unit

Symbol = t Unit = Seconds, s

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Potential Difference Equation:

...

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Potential difference =

Potential difference = current x resistance

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Potential difference, Symbol and Unit

Symbol = V Unit = Volts, V

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Resistance, Symbol and Unit

Symbol = R Unit = Ohms, Ω

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Power Equation:

...

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Power =

Power = current x time

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Power, Symbol and Unit

Symbol = P Unit = Watts, W

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Other cards in this set

Card 2

Front

Resistor

Back

A resistor has a straight line graph which passes through the origin. This is a directly proportional relationship. The straight line shows that resistance is constant.

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