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Nat 5 Physics > Topic 3: Electricity > Flashcards

Topic 3: Electricity Flashcards

1
Q

Ammeter

A

A device used to measure electric current

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2
Q

Cell

A

Provides electrical energy to charges in a circuit

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3
Q

Battery

A

Provides electrical energy to charges in a circuit

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4
Q

Voltmeter

A

A device used to measure voltage or potential difference

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5
Q

Variable resistor

A

Used to vary the size of current in a circuit

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6
Q

Motor

A

Converts electrical energy to kinetic energy

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7
Q

Switch

A

Allows current in a circuit when closed. Used to switch on circuits

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8
Q

Bulb

A

Converts electrical energy to light energy

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9
Q

Resistor

A

A component that restricts the flow of electrical current

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10
Q

Solar cell

A

Renewable energy source. Provides electrical energy to recharge batteries

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11
Q

Fuse

A

Melts to break the circuit if the current is too big

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12
Q

Diode

A

Allows current to flow through in one direction only

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13
Q

Capacitor

A

Used in electronic ampilifiers and timing circuits

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14
Q

Light dependant resistor (LDR)

A

Resistor whose resistance changes with light falling on it

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15
Q

Thermistor

A

Device where the resistance will change with temperature

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16
Q

Speaker

A

Converts electrical energy to sound energy

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17
Q

An ammeter is used in…

A

Series

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18
Q

An voltmeter is used in…

A

Parallel

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19
Q

As we increase resistance, the current…

A

Decreases

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20
Q

As we increase voltage, the current

A

Increases

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21
Q

Electricity

A

The presence or flow of charged particles

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22
Q

Ohms Law (formula)

A

V=IR

23
Q

Voltage (V) unit

A

Volts (V)

24
Q

Current (I) unit

A

Amps (A)

25
Q

Resistance (R) unit

A

Ohms (Ω)

26
Q

More voltage =…

A

More current

27
Q

More lamps in a circuit =

A

Less current but more resistance

28
Q

Current in series

A

Current is the SAME at all points

29
Q

Will a series circuit stop if there is a break?

A

Yes, current will stop at all points

30
Q

Relationship formula for series circuit (current)

A

Is = I1 = I2 = I3

31
Q

Current in parallel

A

Current is DIFFERENT at some points. Branches all add up to the supply circuit

32
Q

What does current do in a parallel circuit?

A

It splits and rejoins to return to the supply

33
Q

Will a parallel circuit stop if there is a break?

A

No, the current can still flow in other branches

34
Q

Relationship formula for parallel circuit (current)

A

Is = I1 + I2 + I3

35
Q

Two equations to calculate power

A

P = E/t & P = IV

36
Q

Energy (E) unit

A

Joules (J)

37
Q

Time (t) unit

A

Seconds (s)

38
Q

Power (P) unit

A

Watts (W)

39
Q

What is UK mains voltage?

A

230V

40
Q

What does the number of electrons determine?

A

Current

41
Q

Voltage in series

A

Voltage SPLITS and rejoins to the supply circuit

42
Q

Voltage in parallel

A

Voltage stays the SAME at all points

43
Q

Voltage in series relationship formula

A

Vs = V1 + V2 + V3

44
Q

Voltage in parallel relationship formula

A

Vs = V1 = V2 = V3

45
Q

Potential Energy

A

Ep, is the energy gained by a mass, m, while rising to a height, h, working against a gravitational force.

46
Q

Potential Energy formula

A

Ep = mgh

47
Q

Energy unit

A

Joules

48
Q

Kinetic Energy

A

Ek, is the energy which an object of mass, m, possesses by being in motion at speed, v.

49
Q

Kinetic Energy formula

A

Ek = 1/2 mv²

50
Q

Work Done

A

Ew, is the amount of energy it takes to do a task.

51
Q

Work Done formula

A

Ew = Fd

52
Q

What does F also equal in vertical motion?

A

W=mg

53
Q

Distance also equals…

A

height

Nat 5 Physics (4 decks)

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