Equations Flashcards
All equations for Chapter P2
1
Q
What is the equation for power as a rate, using energy?
A
Power (W) = Energy (J) / time (s)
2
Q
What is the power equation as a rate, using work done?
A
Power (W) = Work done (J) / time (s)
3
Q
What is the equation of work done?
A
Work done (J) = Distance (m) * Force (N)
4
Q
What is the domestic energy equation?
A
Energy (kWh) = Power (kW) * time (hours)
5
Q
What is the cost of domestic energy?
A
Cost = number of units * cost per unit
6
Q
What is the efficiency equation (as a percentage)?
A
useful energy output / total energy input *100
