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Physics 4th year > Electricity > Flashcards

Electricity Flashcards

1
Q

Define Voltage

A

Energy transferred per unit charge

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2
Q

Define Current

A

Rate of flow of charge

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3
Q

What are the charge carriers in a circuit

A

Electrons

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4
Q

Define the power rating of an appliance

A

Energy used per second

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5
Q

What is the symbol for charge

A

Q

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6
Q

What is the symbol for voltage

A

V

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7
Q

What is the symbol for current

A

I

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8
Q

What is the symbol of resistance

A

R

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9
Q

Adding resistors in parallel will do what tot the overall resistance?

A

Decreases the overall resistance.

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10
Q

What is ohm’s law?

A

V=IR

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11
Q

What will happen to the current in a circuit with constant resistance when the voltage increases?

A

The current increases.

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12
Q

What happens to the resistance of an LDR if the light level increases?

A

Resistance decreases.

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13
Q

What happens to resistance of a thermistor if the temperature goes up

A

Resistance decreases.

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14
Q

What is the symbol of power?

A

P

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15
Q

State the units of Voltage

A

Volts (v)

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16
Q

State the units of Power

A

Watts (w)

17
Q

State the units of current

A

Amps (A)

18
Q

State units of resistance

A

Ohms

19
Q

State units of Charge

A

Coulombs (C)

20
Q

Which type of fuse would be used in a 500 W appliance?

A

3A

21
Q

Which type of fuse would be used in a 800 W appliance?

A

13A

22
Q

What is used to measure voltage

A

Voltmeter

23
Q

What is used to measure Current

A

Ammeter

24
Q

What is used to measure resistance

A

ohmmeter

25
Q

How is a voltmeter connected?

A

In parallel

26
Q

How is an ammeter Connected?

A

In series.

27
Q

In a parallel circuit current will…

A

In a parallel circuit current will split between branches.

28
Q

If a large and small resistor are connected in parallel, which will receive more current?

A

Small resistor. Current will take path of least resistance.

29
Q

In a parallel circuit the voltage will…

A

In a parallel circuit the voltage will be equal to the supply across each branch.

30
Q

In a series circuit voltage will…

A

be shared between components.

31
Q

In a series circuit current is…

A

the same at all points.

Physics 4th year (1 decks)

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