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electric current

Total questions: 42

Worksheet time: 30mins

Name
Class
Date
1.
Which word means how hard it is for electrons to flow?
a)
Current
b)
Voltage
c)
Resistance
d)
Power
2.
This is an example of a _______ circuit
a)
open
b)
series
c)
parallel
d)
square
3.
If the Voltage is increased and the resistance stays the same, Current will
a)
Increase
b)
Decrease
c)
Stay the same
d)
Not enough info
4.
If the Voltage stays the same and Resistance is increased, Current will 
a)
Increase
b)
Decrease
c)
Stay the same
d)
Not enough info
5.
In a series circuit, which of the following is the same throughout the circuit?
a)
Resistance
b)
Voltage
c)
Current
d)
Power
6.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
7.
What does power mean?
a)
Joules transferred per second
b)
Electron flow per second
c)
Speed of electrons
d)
Electron energy
8.
What is resistance measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
9.
What voltage is needed to produce 2A of current through a 10Ω resistor?
a)
20V
b)
0.2V
c)
5V
d)
2V
10.
A circuit with 3 resistors, 20 Ohms, 10 Ohms, and 20 Ohms are in series. What is the total resistance?
a)
43 Ohms
b)
50 Ohms
c)
60 Ohms
d)
33 Ohms
11.
Battery cells are connected in series to _______
a)
Increase voltage output
b)
Decrease voltage output
c)
Increase current capacity
d)
Decrease current capacity
12.
AC stands for ___.
a)
Alternating Current
b)
Attraction Connections
13.
Current is...
a)
moving protons
b)
moving electrons
c)
measured in volts
d)
measured in ohms
14.
Voltage is simply defined as...
a)
what 'pushes' electrons
b)
what 'stops' electrons
c)
moving electrons
15.
Resistance is...
a)
What "slows down" electrons
b)
What "speeds up" electrons
c)
Moving electrons
d)
What "pushes" electrons
16.
If the voltage stays the same, but the resistance goes up, the current will....
a)
increase (speed up)
b)
decrease (slow down)
c)
stay the same
17.
If the current increases it could be because of...
a)
increasing voltage
b)
decreasing resistance
c)
both
18.
A light bulb is an example of a _______.
a)
current
b)
resistor
c)
battery
19.
When more branches are added to a parallel circuit, ____________________.
a)
resistance decreases
b)
voltage increases
c)
nothing changes
20.

A potential difference of 24 V is applied to a 150 resistor. How much current flows through the resistor?

a)

0.15 A

b)

3600 A

c)

6.25 A

d)

0.16 A

21.
An object through which electrons can easily flow is called a(n) ___________.
a)
Conductor
b)
Insulator
22.
What size resistor would produce a 3 Amp current flow with a 12 Volt battery
a)
1 Ohm
b)
3 Ohms
c)
4 Ohms
d)
12 Ohms
23.
What is the Voltage of a circuit that has a resistance of 5 Ω and a current of 2 A?
a)
25 V
b)
10 V
c)
2.5 V
d)
0.4 V
24.
An ampere is measured in _____
a)
milliseconds
b)
seconds
c)
minutes
d)
hours
25.
An electric current is made up of _____ charged electrons
a)
neutral
b)
negative
c)
positive
d)
balanced
26.

A device that converts chemical energy into electrical energy is call a

a)

battery

b)

conductor

c)

parallel circuit

d)

flashlight

27.

Most circuits include a device that opens and closes the circuit. This device allows you to turn a light bulb on and off. This device is a

a)

computer

b)

wire

c)

switch

d)

flashlight

28.

Home circuits have a safety device that opens or breaks the circuit when it overheats. This device is called a

a)

flashlight

b)

circuit breaker

c)

conductor

d)

simple circuit

29.

Current is...

a)

moving protons

b)

moving electrons

c)

measured in volts

d)

measured in ohms

30.

A material that prevents heat or an electric current from flowing

a)

Conductor

b)

Insulator

c)

Magnetism

d)

Electric Circuit

31.

The current in the resistor X is 2.0 A and the current in the 6.0 Ω resistor is 0.5 A. Calculate the current in resistor Y

a)

0.5 A

b)

1.5 A

c)

2.5 A

d)

3.5 A

32.

The current in the resistor X is 2.0 A and the current in the 6.0 Ω resistor is 0.5 A. Calculate the resistance of resistor Y

a)

6.0 Ω

b)

2.0 Ω

c)

4.0 Ω

d)

3.0 Ω

33.

An electrical junction has three wires A, B and C connected to it. Wire A carries 4.2 A going in, wire B carries 2.6 A going out. What does wire C carry?

a)

1.6 A going in

b)

1.6 A going out

c)

6.8 A going in

d)

6.8 A going out

34.

Analysis of a circuit produces two loop equations:

10x + 30y = 7 and 40x - 20y = 0

What are the currents x and y?

a)

x = 50 and y = 10

b)

x = 0.2 and y = 0.1

c)

x = 0.01 and y = 0.02

d)

y = 0.2 and x = 0.1

35.

Select the correct statement:

a)

The current in parallel resistors is always equal.

b)

The sum of the sources of EMF and volt-drops in a closed loop is zero.

c)

The sum of the currents in a closed loop is zero.

d)

The sum of the voltages at a node is zero.

36.

An electrical junction has four wires A, B, C and D connected to it. Wire A carries 7A going in, wire B carries 5 A going out and wire C carries 2 A going in. What does wire D carry?

a)

10 A going out

b)

5 A going out

c)

4 A going in

d)

4 A going out

37.

Kirchhoff's 2nd law deals with

a)

current in circuit

b)

voltage in circuit

c)

e.m.f in circuit

d)

voltage in circuit and e.m.f in circuit

38.

An electrical junction has three wires A, B and C connected to it. Wire A carries 4.2 A going in, wire B carries 2.6 A going out. What does wire C carry?

a)

1.6 A going in

b)

1.6 A going out

c)

6.8 A going in

d)

6.8 A going out

39.

What is the potential difference of location "B" in the circuit compared to location "A".? (for 3 points)

a)

ΔVAB=-16V

b)

ΔVAB = +16V

c)

ΔVAB = -2V

d)

ΔVAB = -22V

40.

Two resistors, R1R_1 and R2 R_2\ are connected in SERIES. If R2 > R1R_2\ >\ R_1 , which among the statements is TRUE about the electric currents that passes thru each resistor?

a)

I1 > I2I_1\ >\ I_2

b)

I1=I2I_1=I_2  

c)

I1<I2I_1<I_2  

41.

Refer to the circuit diagram shown. What is its total electric current?

a)

0.664 A0.664\ A  

b)

0.658 A0.658\ A  

c)

0.259 A0.259\ A  

d)

0.125 A0.125\ A  

42.

In the circuit below, what is the voltage across R1?

a)

12 V

b)

6 V

c)

8 V

d)

4 V

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