P4 Flashcards

1
Q

What is an circuit diagram ?

A

A circuit diagram shows how the components on a circuit are connected together .

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2
Q

What is a cell ?

A

A cell is necessary to push electrons around a complete circuit .

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3
Q

What is a battery ?

A

A battery consists of two or more cells .

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4
Q

What is a switch ?

A

A switch enables the current in a circuit to be switched on or off .

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5
Q

What is an indicator ?

A

An indicator , such as a bulb is designed to emit light as a signal when a current passes through it .

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6
Q

What is a diode ?

A

A diode allows current through in one direction

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7
Q

What is an LED ( light emitting diode )

A

An LED emits light when a current passes through it

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8
Q

What is an ammeter ?

A

Used to measure an electric current

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9
Q

What is a fixed resistor ?

A

Limits the current in a circuit .

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10
Q

What is a variable resistor ?

A

Allows the current to be varied.

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11
Q

What is a fuse ?

A

A fuse is designed to melt and therefore break the circuit if the current passing through it , is greater than a certain amount .

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12
Q

What is a heater ?

A

Designed to transfer the energy from an electric current to heat the surroundings .

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13
Q

What is a voltmeter ?

A

Used to measure potential difference .

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14
Q

What is an electric current ?

A

The flow of electrons around a circuit

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15
Q

What are three sources of potential difference ?

A

A cell , a battery and an electrical generator .

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16
Q

In which direction do the electrons travel ?

17
Q

What is potential difference also known as ?

18
Q

Where can you place a voltmeter ?

A

Across a cell / battery or across a lamp .