10.18-10.31 Current and energy part 2 Flashcards

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1
Q

How does resistance change with a filament lamp?

A

.Greater intensity of light, lower the resistance

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2
Q

How does resistance change when a diode is added?

A

.Allows low resistance in one direction

.Opposite direction=Very high resistance as it stops current going in one direction

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3
Q

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

A

.Resistance greatest when dark

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4
Q

How does the resistance of a thermistor change with temperature?

A

.Hotter temperatures-resistance is lower

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5
Q

What happens when there is an electrical current in a resistor?

A

.There is a energy transfer which heats the resistor

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6
Q

What happens to electrical energy when electrical current does work against electrical resistance?

A

It dissipates as thermal energy in the surroundings

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7
Q

What is the energy transfer from electrical energy to thermal energy a result of?

A

Collisions between the electrons and ions in the lattice

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8
Q

How could you reduce energy transfer?

A

Use low resistance wires

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9
Q

Give two disadvantages of heating effect on a electrical current

A

.Production of excessive amounts of heat in a circuit can be dangerous
.Poorly maintained devices could catch fire

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10
Q

What is power?

A

The energy transferred per second

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11
Q

What is the power transfer in any circuit related to?

A

.The potential difference across it and current in it

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