Science - P4 - Electrostatics and Using electricity safely

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How can the chance of getting an electric shock be reduced?
-correct earthing -standing on insulating mats -wearing socks with insulating soles -bonding fuel tanker to aircraft.
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Electrostatic effects are caused by the transfer of ELECTRONS.
A positively charged object LACKS electrons, whereas a negatively charged object has EXTRA electrons.
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There are two kinds of electric charge, positive&negative.. like chargers repel and unlike charges attract.
Uses of electrostatics include: Defibrillators, paint spraying, dust precipitatiors and photocopiers.
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In a three pin plug: live wire is at a high voltage, neutral wire completes the circuit, earth wire is connected to the case to prevent it becoming live. DOUBLE INSULATED appliances do not need an earth wire.
The fuse (or circuit breaker) is in the live wire. if the current is greater than the rating, the fuse will melt (or circuit breaker switch) breaking the circuit.
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LONGER wires have MORE resistance.
THINNER wires have MORE resistance.
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Other cards in this set

Card 2

Front

Electrostatic effects are caused by the transfer of ELECTRONS.

Back

A positively charged object LACKS electrons, whereas a negatively charged object has EXTRA electrons.

Card 3

Front

There are two kinds of electric charge, positive&negative.. like chargers repel and unlike charges attract.

Back

Preview of the front of card 3

Card 4

Front

In a three pin plug: live wire is at a high voltage, neutral wire completes the circuit, earth wire is connected to the case to prevent it becoming live. DOUBLE INSULATED appliances do not need an earth wire.

Back

Preview of the front of card 4

Card 5

Front

LONGER wires have MORE resistance.

Back

Preview of the front of card 5

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