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Physics > Electricty/Electronics > Flashcards

Electricty/Electronics Flashcards

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0
Q

What is used to measure current in a circuit?

A

Ammeter

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1
Q

What is electrical current?

A

A flow of electrons

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2
Q

Current is measured in..

A

Amperes or Amps (A)

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3
Q

Voltage is measured by…

A

Placing a voltmeter across a component

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4
Q

Voltage is measured in…

A

Volts (V)

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5
Q

How does the current travel in a series circuit?

A

Along one path

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6
Q

Explain current in a series circuit

A

The same at every point

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7
Q

How is the supply voltage calculated in a series circuit?

A

Voltage supply = voltage 1 + voltage 2 and so on…

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8
Q

How does current travel in parallel circuits?

A

Along branches

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9
Q

Switches in series circuits must always be……. For the current to flow

A

Closed

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10
Q

Switches in parallel can be…..

An example of switches in parallel is…

A

Switched on depending on the branch

Household lighting

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11
Q

How do you measure resistance?

A

Ohmmeter

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12
Q

What is resistance measured in?

A

Ohms

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13
Q

What factors affect resistance?

A

The longer the wire the higher the resistance

The thinner the wire the higher the resistance

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14
Q

What happens if the resistance is increased in a circuit?

A

The current is decreased

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15
Q

What is power rating?

A

Which electrical energy is converted in to other forms

16
Q

What is the change in a toaster? (Energy)

A

Electrical to heat energy

17
Q

How is efficiency calculated?

A

%Efficiency= output/input*100

18
Q

What is direct current?

A

Direct current is when the current in a circuit passes in one direction ONLY.

19
Q

What is alternating current?

A

Alternating current is when the current changes direction every fraction of a second

20
Q

Mains sockets supply …. volts and have a frequency of …..Hz

A

230v

50Hz

21
Q

Explain electric fields..

A

Negative sign with arrows pointing towards it
Positive sign with arrows pointing away
5 positive signs point to 5 negative signs

22
Q

What would a graph of a light build look like?

A

The radiant gradually increases as the resistance of the bulb increases as more current is passed through it.

23
Q

In a plug what colour is the live wire?

A

Brown

24
Q

In a plug the neutral wire is..

A

Blue

25
Q

The earth wire in a plug is..

A

Yellow and green

26
Q

What does the double insulated symbol look like?

A

Big square with a smaller square inside

27
Q

When would a 3A fuse be used?

A

For power less than 700 watts

28
Q

When would a 13A fuse be used?

A

When the power is more than 700 watts

Physics (8 decks)

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