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Power!Power is a measure of how quickly energy is transferred. The unit of power is the watt, W.
The more energy that is transferred in a certain time, the greater the power.
A 100 W light bulb transfers more electrical energy each second than a 60 W light bulb.
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Power!Power is a calculated by using this equation:
For example, what is the power of a 5 A, 1.5 V lamp?
P = I × V
Power = 5 × 1.5 = 7.5 W
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Energy from the energy source
Thermal energy
Light
Energy efficient light bulb
Where the Energy at?
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Energy from the energy source
Light
Thermal energy
Energy inefficient light bulb
Where the Energy at?
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What fuse to use?Fuses restrict current.
Fuses come in standard ratings of 3 A, 5 A or 13 A.
Multi-boxes have fuses to restrict the current that flows into them – otherwise, they will overheat and blow up!
P = I × V
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What fuse to use?Fuses blow if the current they restrict is exceeded – avoiding the multi-box from blowing up!
Which fuse should be used for a multi-box with a 1,150 W heater and a 50 W lamp plugged into it? The multi-box is plugged into the mains (240 V). The circuit is parallel.
P = I × V
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What fuse to use?Which fuse should be used for a multi-box with a 1,150 W heater and a 50 W lamp plugged into it? The multi-box is plugged into the mains (240 V).
I =
I =
= 5.0 A - Therefore use the 13A fuse.