P7.1 Work Flashcards

1
Q

Power

A

Rate at which energy is transferred

Power(W-watts) = Work(J-joules) / Change in time(s-seconds)

Power(W-watts) = Resistance(Ω-ohms) x Current² (A-amps)

Power(W-watts) = Voltage(V-volts) x Current(A-amps)

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2
Q

Work

A

Using forces to transfer energy between stores
Using a force to move an object a distance
Lifting suitcases is doing work against gravity
Pulling a suitcase in a straight line is doing work against friction.
Work (joules) = Force (N) x Displacement (m)

Work = Kinetic energy

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3
Q

How many joules are in a kilojoule

A

1000J

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4
Q

Define power

A

Rate at which energy is transfered

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5
Q

How does lubrication increase efficiency

A

Reduces friction between objects

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