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Physics (P2) > Electricity > Flashcards

Electricity Flashcards

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1
Q

What units do we measure charge in?

A

Coulombs

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2
Q

What particles carries the charge in a circuit?

A

Electrons

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3
Q

Can conductors conduct electricity?

A

Yes

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4
Q

Can insulators conduct electricity?

A

No

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5
Q

What is a electrical current?

A

The rate of flow of charge (The amount of charge per second)

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6
Q

What are the units of current?

A

Amps (A)

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7
Q

What is used to measure current?

A

Ammeter

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8
Q

What is used to measure the potential difference?

A

Voltmeter

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9
Q

How do you connect an ammeter to a crcuit?

A

In series

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10
Q

How do you connect a voltmeter to a circuit?

A

In parallel

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11
Q

State the equation linking charge flow and current

A

Q = I x T

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12
Q

State the units for:
Charge
Current
Time

A

Coulombs (C)
Amps (A)
Seconds (s)

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13
Q

How does increasing the potential difference of a source affect the current in a circuit?

A

The higher the potential difference of the source (cell, or battery) the higher the current in the circuit

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14
Q

What is resistance?

A

Anything that slows the flow down

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15
Q

How does increasing the resistance in a circuit affect current?

A

The higher the resistance, the lower the current (for a given potential difference

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16
Q

What causes the resistance in a circuit?

A

Collisions between the electrons carrying charge and the positive metal ions vibrating in fixed positions

17
Q

Explain how increasing the length of a wire affects its resistance.

A

· More ions in the wire
· So more collisions of electrons with ions

18
Q

State one factor, other than length, that affects the resistance of a wire.

A

Thickness of the wire (Thinner the wire, the greater the resistance)

19
Q

What equation link potential difference, current and resistance?

A

V = I x R

20
Q

What are the units of resistance?

A

Ohms (Ω)

21
Q

What are the units for Potential difference?

A

Volts (V)

Physics (P2) (6 decks)

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