Physics Equations Flashcards
What is the efficiency equation?
Efficiency = Useful output energy transferred by the device (J)
—————————————————
Total input energy supplied to the device (J)
What is the power equation?
Power = Energy transferred to appliance, E (Joules, J)
———————————————
Time taken for energy to be transferred, t (seconds, S)
What is the power of an appliance equation?
E
P= –
T
What is the efficiency of an appliance equation?
Useful energy in
—————– (X 100%)
Total power in
What is the equation for the electric current of a circuit?
Q
I = –
T
What is the potential difference across a component equation?
Energy transferred, E
V= ———————
Charge, Q
What is the potential difference across a resistance equation?
Potential difference, V
R= ———————
Current, I
What is the resistance of an appliance equation?
V
R= —
I
What is the frequency equation?
1
Frequency= ———————-
Time taken for 1 cycle
What is the energy transferred to a device equation?
E = P x t.
What is the electrical power supplied to an appliance equation?
P = I x V
What is the charge flow equation?
Q = I x t.
What is the energy transferred to a component equation?
E = V x Q
What is the energy supplied to an appliance equation?
E = P t.
What is the useful energy used equation?
Useful energy used = efficiency x energy supplied
