# Electricity

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• Created by: Sunset
• Created on: 03-01-14 10:04
How is voltage calculated?
Energy Transferred (work done) / Charge
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How is electrical power calculated?
Current x voltage
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Voltage in parallel is
The same everywhere
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Current in series is
The same everywhere
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What is a flow of charged particles called?
Current
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What is the frequency of AC mains supply in the UK?
50Hz
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Describe electrons in DC (direct current)
Travel in one direction
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What is resistance measured in?
Ohms
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Is a diode an ohmic or non-ohmic resistor?
Non-ohmic
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How is an LDR used in security lights?
As it gets darker, the resistance of the LDR increases. This causes the lamp to switch on.
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If a circuit has 2C and 4V over 4s, what is its power?
2W
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What colour is the live wire?
Brown
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You have a choice of a 1A, 3A or 10A fuse to replace the old one in a 460W microwave. Which do you pick?
3A
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Why are the pins in a plug made of brass?
Brass is durable and doesn't corrode so the pin will always fit into the socket
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Why should electricians wear rubber soled boots when working?
So they aren't earthed, as rubber has a very high resistance so very little current can pass through you to the ground
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## Other cards in this set

### Card 2

#### Front

How is electrical power calculated?

#### Back

Current x voltage

### Card 3

#### Front

Voltage in parallel is

### Card 4

#### Front

Current in series is

### Card 5

#### Front

What is a flow of charged particles called?