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Physics > Current Electricity > Flashcards

Current Electricity Flashcards

1
Q

What is current and its formula, symbol and unit?

A

The amount of charges flowing per unit time. Current = Charge ÷ Time. Unit: A (Ampere). Symbol: I

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2
Q

What is the formula for charge and its unit?

A

Q = ne
n is the number of electrons and e is the charge of 1 electron.
Unit: C (coulomb)

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3
Q

What is the charge on 1 electron?

A

1.6 X 10^-19 C

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4
Q

What does an ammeter measure?

A

It is used to measure current

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5
Q

What scale on an ammeter will you use to measure 4A?

A

A 0-5 scale because it is more accurate

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6
Q

What does a milliammeter do?

A

It is used to measure very small current

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7
Q

What is electromotive force?

A

The work done per unit charge moved around a complete electric circuit

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8
Q

What is the formula of e.m.f?

A

E.M.F = Workdone ÷ Charge

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9
Q

What is e.m.f measured in?

A

J/C or V

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10
Q

What is the advantage of using cells in parallel?

A

Lamps glow more brightly

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11
Q

What is the potential difference and the formula, symbol and unit?

A

It is the electrical work done to carry unit charge between 2 points in an electrical circuit.
V = Electrical energy/Work done ÷ charge
unit: v (volt)

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12
Q

What does a voltmeter measure?

A

The voltmeter measures voltage

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13
Q

How are voltmeters and ammeters connected to a battery?

A

The positive terminal of the voltmeter/ammeter is always connected to the positive terminal of the battery

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14
Q

In what circuit is a voltmeter connected?

A

Parallel

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15
Q

In what circuit is an ammeter connected?

A

Series

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16
Q

What is the formula for resistance? Unit?

A

R = V ÷ I
unit: ohm

17
Q

What is ohm’s law?

A

It states that the current passing through a conductor is directly proportional to the voltage difference across the conductor provided that the temperature is kept constant

18
Q

What is the formula for ohms law?

A

V = IR

19
Q

What happens to the resistance when temperature is increased?

A

The resistance increases

20
Q

What happens to the resistance when voltage increases?

A

When voltage increases, temperature increases thus resistance increases

21
Q

How does a light dependant resistor work?

A

When light increases the resistance will decrease

22
Q

How do you calculate the net resistance in a series circuit?

A

net resistance = R1 + R2

23
Q

How do you calculate the net resistance in a parallel circuit?

A

(1÷R1 + 1÷R2)-1

24
Q

What is the advantage of cells arranged in series?

A
25
Q

What is the resistance of the wire proportional to?

A

Its length
(The longer the wire the higher its resistance)

26
Q

What is the resistance of a wire inversely proportional to?

A

The wires area
(The thicker the wire the lower its resistance)

Physics (23 decks)

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