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Flashcards in Physics Equations Deck (18)
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1
Q

What is the efficiency equation?

A

Efficiency = Useful output energy transferred by the device (J)
—————————————————
Total input energy supplied to the device (J)

2
Q

What is the power equation?

A

Power = Energy transferred to appliance, E (Joules, J)
———————————————
Time taken for energy to be transferred, t (seconds, S)

3
Q

What is the power of an appliance equation?

A

E
P= –
T

4
Q

What is the efficiency of an appliance equation?

A

Useful energy in
—————– (X 100%)
Total power in

5
Q

What is the equation for the electric current of a circuit?

A

Q
I = –
T

6
Q

What is the potential difference across a component equation?

A

Energy transferred, E
V= ———————
Charge, Q

7
Q

What is the potential difference across a resistance equation?

A

Potential difference, V
R= ———————
Current, I

8
Q

What is the resistance of an appliance equation?

A

V
R= —
I

9
Q

What is the frequency equation?

A

1
Frequency= ———————-
Time taken for 1 cycle

10
Q

What is the energy transferred to a device equation?

A

E = P x t.

11
Q

What is the electrical power supplied to an appliance equation?

A

P = I x V

12
Q

What is the charge flow equation?

A

Q = I x t.

13
Q

What is the energy transferred to a component equation?

A

E = V x Q

14
Q

What is the energy supplied to an appliance equation?

A

E = P t.

15
Q

What is the useful energy used equation?

A

Useful energy used = efficiency x energy supplied

16
Q

What is the density equation?

A

Mass
Density = ——
Volume

17
Q

What is the latent heat equation?

A

E = m L

18
Q

What is the period of a wave equation?

A

1
———–
Frequency