10.1 Voltage and resistance Flashcards

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1
Q

what is voltage?

A

a measure of energy in circuit

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2
Q

what is voltmeter

A

device for measuring voltage (unit: volts (V))

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3
Q

define resistance

A

a measure of how difficult it is for current to flow. (measure in ohms Ω)

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4
Q

define resistor

A

the device which resists the flow of current

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5
Q

Why is it important for all the cells to be connected the same way round?

A

Because if it isn’t connected the same way round, there will be a break in the circuit

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6
Q

What name is given to material which have very low resistance?

A

Good conductor

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7
Q

What name is given to material which have very high resistance?

A

Insulator

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8
Q

What is the formula for current?

A

current (I) = voltage/resistance

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9
Q

What is current?

A

the rate of the flow of electrons. It’s measured in amperes, which are also called amps

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10
Q

What does an ammeter do?

A

It measures current

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