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Physics Nat 5 > topic 2 - electricity: current, potential difference and resistance > Flashcards

topic 2 - electricity: current, potential difference and resistance Flashcards

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1
Q

What must a circuit include for charge to flow through it?

A

A source of potential difference.

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2
Q

What is current?

A

A flow of electrical charge.

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3
Q

What is the equation that links charge flow, current and time?

A

Charge flow = current x time

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4
Q

What is the symbol for charge?

A

Q

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5
Q

What is the symbol for current?

A

I

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6
Q

What is the symbol for time?

A

t

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7
Q

What is charge measured in?

A

Coulombs (C)

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8
Q

What is current measured in?

A

Amperes (amps) (A)

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9
Q

What is time measured in?

A

seconds (s)

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10
Q

At any point in a single closed loop, what is true of the current?

A

It has the same value.

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11
Q

What is another name for potential difference?

A

Voltage

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12
Q

What is the equation that links potential difference, current and resistance?

A

potential difference = current x resistance

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13
Q

What is the symbol for potential difference?

A

V

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14
Q

What is the symbol for resistance?

A

R

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15
Q

What is potential difference measured in?

A

Voltage (V)

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16
Q

What is resistance measured in?

A

Ohms (Ω)

17
Q

When resisitance is increased, what happens to the current?

A

It decreases for a given potential difference across the component.

18
Q

Is the current in an ohmic resistor directly proportional or not? (at a constant temperature)

A

Yes - this means that resistance remains constant as current increases.

19
Q

Give examples of at least 2 components where resistance is not constant.

A

Lamps, diodes, thermistors and LDRs.

20
Q

What is the relationship between resisitance and temperature in a filament lamp?

A

Resistance increases as the temperature of the filament increases.

21
Q

How many directions does the current flow through a diode and why?

A

One direction only - the diode has a very high resistance in the opposite direction.

22
Q

What is the relationship between resisitance and temperature in a thermistor?

A

Resistance decreases as temperature increases.

23
Q

What is the relationship between resisitance and light intensity in a LDR

A

Resistance decreases as light intensity increases.

24
Q

Give one everday itrem where a thermistor is used.

A

A thermostat

25
Q

Give one everyday use of an LDR

A

switching lights on when it gets dark

26
Q

What device do you use to measure current?

A

An ammeter

27
Q

Should an ammeter be placed in series or parallel?

A

In series

28
Q

What device do you use to measure potential difference?

A

A voltmeter

29
Q

Should a voltmeter be placed in series or parallel?

A

In parallel

Physics Nat 5 (30 decks)

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