# phisics

what is an electrical current?
an electrical current is a flow of electric charge.
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what do you measure currents in?
you measure currents in amps using an ammeter
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what is potential difference?
potential difference is the difference of electrical potential between two points.
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what is potential difference measured in?
it is measured in joules (J)
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what is resistance?
The electrical resistance of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor.
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what is resistance measured in?
it is measured in ohms
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what is the equation to work out pressure?
pressure=force/area
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what are the law of moments?
When an object is balanced (in equilibrium) the sum of the clockwise moments is equal to the sum of the anticlockwise moments.
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what is a pivot?
a pivot is a point at which a lever turn around
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What is a lever?
A lever is a simple machine consisting of a beam or rigid rod pivoted at a fixed pivot.
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## Other cards in this set

### Card 2

#### Front

what do you measure currents in?

#### Back

you measure currents in amps using an ammeter

### Card 3

#### Front

what is potential difference?

### Card 4

#### Front

what is potential difference measured in?

### Card 5

#### Front

what is resistance?

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