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Physics > P2 - Electricity > Flashcards

P2 - Electricity Flashcards

1
Q

Another name for potential difference

A

Voltage

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2
Q

Fuse

A

Melts if current gets too high

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3
Q

Fixed resistor

A

Restricts amount of current flowing in a circuit

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4
Q

Variable resistor

A

Allows current to be varied

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5
Q

Thermistor

A

Resistance decreases as temperature increases

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6
Q

LDR

A

Light dependent resistor - resistance decreases as light intensity increases

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7
Q

Diode

A

Only allows current to flow one way, resistance is high in reverse

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8
Q

LED

A

Light emitting diode - emits light when current flows

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9
Q

I-V characteristic of filament lamp

A

Resistance is not constant, it increases as p.d increases

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10
Q

Ohm’s law

A

At constant temperature, current is directly proportional to the potential difference across the resistor. Resistance remains constant if temperature remains constant

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11
Q

Ohmic conductor

A

Component that obeys Ohm’s law

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12
Q

I-V characteristic for fixed resistor

A

Current and potential differences are directly proportional, resistance is constant

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13
Q

I-V characteristic of diode

A

Current only flows through diode in one direction, resistance high in reverse

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14
Q

Rule for resistors in series circuit

A

The more resistors, the greater it’s resistance

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15
Q

Cell

A

Store of chemical energy

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16
Q

Battery

A

2 or more cells together

17
Q

Switch open

A

Breaks circuit

18
Q

Switch closed

A

Joins circuit

19
Q

Filament lamp

A

Lights up when current flows because wire gets too hot

20
Q

Ammeter

A
  • measures current through counts per second
  • goes in series
21
Q

Voltmeter

A
  • measures potential difference
  • goes in parallel to component it’s measuring
22
Q

Frequency alternating current in UK mains electricity

A

50Hz

23
Q

Cell in circuit

A

Source of potential difference in a circuit

24
Q

Equation for current, p.d, power

A

P=IV
Power = current x potential difference

Physics (5 decks)

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