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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