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Science > Electrical Systems > Flashcards

Electrical Systems Flashcards

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1
Q

What is the symbol for current?

A

I

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2
Q

What is the SI unit symbol for current?

A

A

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3
Q

What is an ammeter used for?

A

To measure the current passing through a component.

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4
Q

How must the ammeter be connected?

A

In series, positive terminal connected to positive terminal of dry cell.

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5
Q

What is the symbol for volt?

A

V

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6
Q

What is a voltmeter used for?

A

To measure potential difference across a component.

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7
Q

How must the voltmeter be connected?

A

In parallel, positive terminal connected to positive terminal of dry cell.

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8
Q

What is the symbol for resistance?

A

R

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9
Q

What is the SI unit for resistance?

A

Ohm.

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10
Q

What is the ohmmeter/multimeter used for?

A

To measure resistance of a component.

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11
Q

How should the ohmmeter/multimeter be connected?

A

In parallel to the component.

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12
Q

What are the 3 factors affecting resistance?

A
  • Cross section area
  • Length
  • Material
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13
Q

What is the formula for potential difference, current and resistance?

A

Potential difference = current × resistance

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14
Q

What happens to the effective resistance when resistors are connected in series?

A

It becomes larger than the largest individual resistance.

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15
Q

What happens to the effective resistance when resistors are connected in parallel?

A

It becomes smaller than the smallest individual resistance.

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16
Q

When the slider of a rheostat is closer to the top terminal, what happens to the resistance?

A

It is higher.

17
Q

What are the 4 applications of effects of current?

A
  • Chemical
  • Magnetic
  • Heating
  • Lighting
18
Q

What is the symbol for power?

A

P

19
Q

What is the SI unit of power?

A

Watt

20
Q

What is the SI unit symbol for power?

A

W

21
Q

What is the symbol, SI unit and SI unit symbol of energy?

A

E, Kilowatt-hour, kWh

22
Q

What is the symbol, SI unit and SI unit symbol for power?

A

P, Kilowatt, kW

23
Q

What is the symbol, SI unit and SI unit symbol for time?

A

t, Hour, H

24
Q

What is the formula for power, volt and current?

A

Power = VI

25
Q

What is the formula for energy, power and time?

A

Energy = power × time

26
Q

What is the unit for electrical energy used at home?

A

Kilowatt-hour.

Science (9 decks)

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