Electricity Flashcards

1
Q

State an equation that defines current

A

Current = Charge / Time, I = Q/t

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2
Q

Is the long end of the circuit symbol for a cell/battery the positive or the negative terminal?

A

Positive

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3
Q

Is the short end of the circuit symbol for a cell/battery the positive or the negative terminal?

A

Negative

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4
Q

State an equation that defines resistance?

A

Resistance = Voltage / Current, R= V/I

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5
Q

What is the unit of charge?

A

Coulomb (C)

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6
Q

What is the unit of current?

A

Amp (A)

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7
Q

What is the unit of voltage?

A

Volt (V)

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8
Q

What is the unit of power?

A

Watt (W)

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9
Q

What is the unit of resistance?

A

Ohm (Omega)

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10
Q

How does the resistance of a lamp change as temperature changes?

A

Increase in temperature, increase in resistance.

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11
Q

How does the resistance of a thermistor change as temperature changes?

A

Increase in temperature, decrease in resistance.

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12
Q

Why do currents produce heat?

A

Electrons collide with the metal atoms, transferring kinetic energy and making them vibrate more.

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13
Q

Why do metals increase in resistance when you increase the temperature?

A

Increase in temperature means larger, faster vibrations of the metal atoms which block more electrons trying to pass through, which increases resistance.

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14
Q

What is voltage?

A

The energy transferred per unit charge

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