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Physics GCSE > Electricity > Flashcards

Electricity Flashcards

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1
Q

Equation for power and energy

A

Energy = power X time
Power - watts (W)
Energy - joules (J)
Time - seconds (s)

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2
Q

Definition of current

A

Rate of flow of charge

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3
Q

Definition of charge

A

A fundamental property of matter. +/-/0

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4
Q

Equation for current

A

I=Q/t
I- current measured in amps (A)
Q- charge measured in coulombs (C)

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5
Q

Equation for potential difference

A

V=IR
V - potential difference measured in volts (V)
I - current measured in amps (A )
R - resistance measured in Ohms (omega)

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6
Q

Ohms law

A

The current though a resistor at constant temperature is directly proportional to the potential difference across the resistor

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7
Q

Series circuits

A

The current is the same at all points
The total potential difference and resistance is added across the circuit

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8
Q

Parallel circuits

A

The current divides where the circuit branches (add)
The potential difference is the same across the circuit

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9
Q

LDR

A

Light dependent resistor
Dark to light
High to low resistance

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10
Q

Thermistor

A

Temperature dependent
Cold to hot
High to low resistance

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11
Q

Electron flow…

A

…goes the opposite way to current

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12
Q

3 wires in uk sockets

A

Live - brown
Earth - green
Neutral - blue

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13
Q

Potential difference of mains

A

230V

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14
Q

Frequency of mains

A

50Hz

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15
Q

Alternating current

A

Produced by alternating potential difference
Sources through UK mains
(Wavey oscilloscope display)

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16
Q

Direct current

A

Produced by potential difference in one direction
Sources through cells and batteries
(Straight line on oscilloscope display)

17
Q

Equation for energy with charge

A

E=QV
E- energy (J)
Q - charge (C)
V - potential difference (V)

18
Q

Equation for power with current

A

P=IV
P- power (W)
I- current (A )
V - potential difference (V)

19
Q

Equation for power with resistance

A

P=I(2)R
P- power (W)
I - current (A)
R - resistance (omega)

Physics GCSE (7 decks)

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