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Electricity - equations

Total questions: 21

Worksheet time: 16mins

Name
Class
Date
1.
Current is measured in what unit?
a)
ohms
b)
volts
c)
watts
d)
amps
2.
Power is measured in what unit?
a)
amps
b)
volts
c)
watts
d)
ohms
3.
Resistance is measured in what unit?
a)
ohms
b)
amps
c)
watts
d)
volts
4.
What does the Greek letter Ω,  (i.e. Omega) represent?
a)
amps
b)
volts
c)
watts
d)
ohms
5.
What is a kilo equal to?
a)
100
b)
1,000
c)
100,000
d)
1,000,000
6.
what is the power of a lamp whose current is 6 A and the voltage across it is 120 V?
a)
120 W
b)
720 W
c)
16 W
d)
10 W
7.

Which are the Equations for Power?

a)

Power = Energy Transferred / Time (P=E/t)

b)

Power = Work Done / Time (P=W/t)

c)

Power = Energy Transferred x Time (P=Et)

d)

Power = Work Done x Time (P=Wt)

8.

What is the Equation for Charge Flow?

a)

Charge Flow = Current x Time (Q=It)

b)

Charge Flow = Current / Time (Q=I/t)

c)

Charge Flow = Time / Current (Q=t/I)

9.

What is another Equation for Power?

a)

Power = Potential Difference x Current (P=IV)

b)

Power = Potential Difference / Current (P=V/I)

c)

Power = Current / Potential Difference (P=I/V)

10.

Potential difference (pd) / voltage equation

a)

V= IR

b)


V = IRV\ =\ \frac{I}{R}

c)

V = RIV\ =\ \frac{R}{I}

11.

A wire has a resistance of 10 Ω\Omega  . It's length is now tripled, what would its new resistance be?

a)

30Ω

b)

20Ω

c)

10Ω

d)

40Ω

12.

Select all units of current in the list below:

a)

mA

b)

C

c)

V

d)

A

e)

m

13.

How much charge flows through a wire in 80s if the current is a constant 5.4A?

a)

432C

b)

360C

c)

524C

d)

344C

14.
If the current through a circuit is 2 A and the resistance of a light bulb in the circuit is 10 Ohms, what is the voltage difference across the light bulb?
a)
5 V
b)
12 V
c)
0.2 V
d)
20 V
15.

What is this circuit symbol for?

a)

Thermistor

b)

Ammeter

c)

Variable Resistor

d)

Piece of wire

16.

What does voltage mean?

a)

The amount of energy per charge

b)

The amount of power per charge

c)

The amount of electrons per second

d)

The amount of seconds per charge

17.

Potential difference is the same as...?

a)

Voltage

b)

Current

c)

Power

d)

Coulombs

18.

What is the voltage of a bulb which produces 20J of energy for 2 Coulombs of charge?

a)

10V

b)

40V

c)

0.1V

d)

15V

19.
A correct statement of Ohm’s Law is:
a)
I= V R
b)
V ∝ I
c)
V = IR
d)
both b and c
20.

What is the resistance of a bulb if a current of 0.5 A flows through it when there is a voltage of 12 V across it?

a)

24 Ω

b)

6 Ω

c)

24 A

d)

6 A

21.

What is the equation for energy transferred in a circuit?

a)

E=IVtE=IVt

b)

E=ItVE=\frac{I}{tV}

c)

E=IVtE=\frac{IV}{t}

d)

E=tIVE=\frac{t}{IV}

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