- has only one path for the electrical current to take
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Current in Series
-is the same at all positions in the circuit
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Voltage in Series
-supply voltage is equal to the voltage of other components added together, Vs = V1 + V2 + V3...
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Parallel Circuits
-has more than one path for the electrical current to take
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Current in Parallel
-total Current is equal to the sum of the currents in the branches, It = I1+I2+I3
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Advantages of Parallel
-lights can be switched on and off dependently, if one light no longer works the rest can remain on, all lights get the same voltage so can be the same brightness
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Voltage and Current
-As voltage increases, current decreases
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Resistance
-is the opposition to current, measured in ohms, symbol R
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Ohmeter
- used to measure resistance, must be connected in parallel
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Resistance Effects
-will cause wires and components to heat up because if converts some of the electrical energy into heat energy -useful in kettle or toaster - not useful in computer as fan will be needed to cool it down
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Wires and Resistance
-the thicker the wire the lower the resistance
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Variable resistance
-a device which changes the resistance in the circuit -By using a longer wire, the resistance increases
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Uses for Variable resistance
-brightness control -sound level control -speed control -temperature control
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Ohms Law
V=IR - Volatage = Current times Resistance
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Other cards in this set
Card 2
Front
-is the same at all positions in the circuit
Back
Current in Series
Card 3
Front
-supply voltage is equal to the voltage of other components added together, Vs = V1 + V2 + V3...
Back
Card 4
Front
-has more than one path for the electrical current to take
Back
Card 5
Front
-total Current is equal to the sum of the currents in the branches, It = I1+I2+I3
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