Energy cannot be created or destroyed, only transferred from one store to another
1 of 5
What is the equation for work done?
W = F x d
Work done (J) = Force (N) x Distance (m)
2 of 5
When is work done considered wasteful?
In mechanical processes causing energy to be transferred to the surroundings by heating
3 of 5
1) What is the definition of 'power'?
2) What are the equations for power?
1) The rate at which work is done
2) Power (W) = Work done (J) / time (secs)
Power (W) = Energy transferred (J) / time (secs)
*Note that 1 watt is equal to 1 J/s
4 of 5
1) What is the definition of efficiency?
2) What is the equation of efficiency
1) The proportion of energy converted to a useful form as opposed to wasteful forms
2) Efficiency = useful energy / total input energy
*Efficiency is expressed as a percentage
5 of 5
Other cards in this set
Card 2
Front
What is the equation for work done?
Back
W = F x d
Work done (J) = Force (N) x Distance (m)
Card 3
Front
When is work done considered wasteful?
Back
Card 4
Front
1) What is the definition of 'power'?
2) What are the equations for power?
Back
Card 5
Front
1) What is the definition of efficiency?
2) What is the equation of efficiency
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