P2 - electrical circuits

1. component graphs

1.1. resistor

1.1.1. straight line

1.2. bulb

1.2.1. curve

1.3. diode

1.3.1. current only flows when voltage is grater than 0.6V

2. safety

2.1. earth lead

2.1.1. current flows straight to earth

2.1.2. protects against electric shock

2.2. fuse

2.2.1. melts if current is too big

2.2.2. no protection against electric shock

2.3. miniature circuit breaker (mcb)

2.3.1. replace fuses

2.3.2. electromagnet

2.3.3. breaks circuit if current is too big

2.3.4. no protection against electric shock

2.4. residual current device (rcd)

2.4.1. protects against electric shocks

2.4.2. compares current in live and neutral wires

2.4.3. should be used in gardens

2.5. UK = 240V (US and Europe=110V)

3. measurements

3.1. voltage

3.1.1. voltmeter

3.1.1.1. parallel

3.1.2. volts (V)

3.2. current

3.2.1. flow of charge

3.2.2. ammeter

3.2.2.1. series

3.2.3. amps (A)

3.3. power

3.3.1. energy used per second

3.3.2. Watts (W)

4. plug

4.1. live

4.1.1. fuse

4.1.2. brown

4.2. earth

4.2.1. green and yellow

4.3. neutral

4.3.1. blue

4.4. insulation