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RGS 4th Form Physics MAC > 3 Energy and Voltage > Flashcards

3 Energy and Voltage Flashcards

1
Q

Unit of current is …..

A

amps

A

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2
Q

Current is the …

A

rate of flow of charge

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3
Q

Unit of energy is …..

A

joules

J

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4
Q

energy transferred E =

A

E = IVt

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5
Q

Unit of voltage is …..

A

Volts

V

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6
Q

Voltage =

(the equation with energy in)

A

voltage = energy / charge

V = E/Q

1 volt = 1 joule / coulomb

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7
Q

Voltage V =

(the equation with R in)

A

V=IR

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8
Q

What is resistance?

A

oppostion to flow of charge.

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9
Q

Power P =

A

Power = energy / time

or

P=IV

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10
Q

Unit of power is…

A

Watts (W)

1 W = 1 J/second

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11
Q

What type of circuit is this? Series or parallel?

A

Series circuit

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12
Q

What component symbol is shown below?

A

variable resistor

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13
Q

What component symbol is shown below?

A

thermistor

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14
Q

What component symbol is shown below?

A

ammeter

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15
Q

What component symbol is shown below?

A

diode

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16
Q

What component symbol is shown below?

A

buzzer

17
Q

What component symbol is shown below?

A

motor

18
Q

What component symbol is shown below?

A

voltmeter

19
Q

What component symbol is shown below?

A

bulb

20
Q

What component symbol is shown below?

A

Fuse

21
Q

What component symbol is shown below?

A

Light emitting diode

22
Q

What component symbol is shown below?

A

Light dependent resistor

23
Q

What can you say about the current in a series circuit and the current in a parallel circuit?

A

Series - current is the same everywhere

Parallel - current splits between the branches

current into a junction = current out of a junction

24
Q

Each cell provides 3 V

In which circuit (series or parallel) are the bulbs brighter?

A

Parallel bulbs are brighter

Series- voltage is shared - VCell = V1 + V2

Parallel - each bulb gets the full voltage of the cell - Vcell = V1 = V2

25
Q

Why are the bulbs dimmer in the second circuit?

A

Voltage is shared between bulbs in series

Less voltage across cell therefore bulb is dimmer.

26
Q

Explain why the second circuit draws a lower current from the cell?

A

circuit with two bulbs in series has larger resistance

so current decreases for same voltage

27
Q

What is true about the current in a series circuit?

A

Current is the same everywhere in a series circuit

28
Q

How does the resistance of an LDR vary with light intensity?

A

As light intensity increases, resistance decreases

29
Q

How does the resistance of an thermistor vary with temperature?

A

As temp increases, resistance of thermistor decreases

30
Q

What can you say about the voltage in a series circuit and the voltage in a parallel circuit?

A

Parallel - voltage is the same across each branch

Series - voltage splits

total voltage = sum of all voltages across components

RGS 4th Form Physics MAC (8 decks)

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