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ELC 138 Ch. 3 and 4 Test

Total questions: 47

Worksheet time: 48mins

Name
Class
Date
1.
The first two color bands are........
a)
Always Red In Color
b)
Digits
c)
Tolerance
d)
Gold or Silver
2.
The third color band is a _______ or __________
a)
Gold or Silver
b)
Green or Blue
c)
2k or 5k ohms
d)
multiplier or number of zeros
3.

The fourth color band represents

a)

Digits

b)

Tolerance

c)

Voltage

d)

Multiplier or number of zeros

4.
The gold color band refers to__________tolerance.
a)
 + / - 20%
b)
 + / - 10%
c)
 + / - 5%
d)
zero
5.

If the fourth color band old is gold on a 100 ohm resistor. The range for the tolerance is between_____and ______

a)

95% and 105%

b)

95% and 110%

c)

+ / - 5% of 1K

d)

80% and 120%

6.

Identify this electronic testing tool

a)

GPS Tracker

b)

Jump Wire

c)

Multimeter

d)

Breadboard

7.
Color code for 
27 kΩ +/-5 %
a)
brown, violet, orange, gold
b)
red, violet, orange, gold
c)
red, violet, red, gold
d)
orange, violet, red, gold
8.

Color code for 10 Ω +/- 20%

a)

brown, black, brown, silver

b)

brown, black, brown, gold

c)

brown, black, black, gold

d)

brown, black, black

9.
Color code for 6.8 MΩ +/- 5%
a)
green, violet, yellow, gold
b)
gray, white, green, gold
c)
blue, gray, green, gold
d)
blue, green,gray, gold
10.
Which of these is a very good insulator?
a)
water
b)
silver
c)
wood
d)
rubber
11.

What is the color for the numerical value of 2 on a resistor?

a)

brown

b)

black

c)

orange

d)

red

12.
What are the color codes for a 470k ohm resistor?
a)
Yellow, Violet, Yellow
b)
Orange, Grey, Orange
c)
Yellow, Violet, Orange
d)
Orange, Grey, Yellow
13.
A conductor____________________________
a)
will not conduct current
b)
resists current flow
c)
provides a path for current flow
d)
provides no path for current flow
14.
Which of these is NOT a requirement for a simple circuit?
a)
Voltage
b)
Load
c)
Conductor
d)
Light
15.
What is the tolerance for a Red, Brown, Brown, Silver resistor?
a)
1%
b)
20%
c)
5%
d)
10%
16.
What is the resistance for a Red, Brown, Black resistor?
a)
21 Ohms
b)
210 Ohms
c)
12 Ohms
d)
120 Ohms
17.

Resistance is measured in:

a)

volts

b)

amps

c)

ohms

d)

watts

18.
What is the color code for a Orange, Black, Red resistor?
a)
3k Ohms
b)
200 Ohms
c)
300 Ohms
d)
2K Ohms
19.
What is the purpose of a resistor?
a)
control current flow
b)
allow current flow
c)
prevent current flow
d)
allow heat to build up
20.

Current is measured in:

a)

volts

b)

amps

c)

ohms

d)

watts

21.

Which resistor will allow the most current flow?

a)

1 ohm

b)

100 ohms

c)

1000 ohms

d)

0.5k ohms

22.
How does resistance affect current?
a)
less resistance - less current
b)
more resistance - less current
c)
more resistance - more current
d)
resistance does not affect current
23.

What is the resistor value for Brown Black Gold?

a)

105 ohms

b)

102 ohms

c)

1 ohms

d)

10000 ohms

24.

A resistor's first three color bands are brown, black, and red. What is its value?

a)

10 ohms

b)

10 Kohms

c)

200 ohms

d)

1 Kohms

25.

What size resistor would produce a 0.3 Amp current flow with a 12 Volt battery

a)

3.6 Ohm

b)

36 Ohms

c)

40 Ohms

d)

4 Ohms

26.
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
27.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
28.
Current times Resistance equals
 (I X R)
a)
Power
b)
Voltage
c)
Amperage
d)
Ohm
29.

Voltage divided by Resistance

(V / R)

a)

Current

b)

Power

c)

Ohms

d)

Watts

30.

If the Voltage is increased and the resistance stays the same, Current will

a)

Increase

b)

Decrease

c)

Stay the same

31.

If the Voltage stays the same and Resistance is increased, Current will

a)

Increase

b)

Decrease

c)

Stay the same

32.

How many Volts would we need to produce a current flow of 80 mA through a 600 Ohm resistor

a)

12 volts

b)

24 volts

c)

1.3 volts

d)

48 volts

33.

This circuit has a 24 volt battery and the resistor is 8k ohms. How many amps are running through the circuit?

a)

3 mA

b)

3 A

c)

192 mA

d)

30 mA

34.

To complete a circuit so that a light will turn on, the switch must be

a)

unattached

b)

open

c)

closed

d)

It depends

35.

What resistance is needed to cause a 20mA current flow because of a 100V battery?

a)

0.2Ώ

b)

5Ώ

c)

120Ώ

d)

5000 Ώ

36.

Which of the following circuit diagrams is an open circuit?

a)
b)
c)
d)
37.

What is the unit for power?

a)

Ampere

b)

Ohm

c)

Volt

d)

Watt

38.

A hair dryer draws 14.0 amps from a 120 volt circuit. How much power did the hair dryer use?

a)

11.67 Watt

b)

8.57 Watt

c)

1680 Watt

d)

840 Watt

39.

A kilovolt (kV) is how many volts?

a)

10

b)

50

c)

100

d)

1000

40.

Calculate the voltage applied when a 60 watt light-bulb uses a current of 5 amps

a)

300 volts

b)

30 volts

c)

12 volts

d)

0.08 volts

41.

Calculate the power generated as a 20 A current flows through a 10Ω resistor?

a)

2 W

b)

200 W

c)

4000 W

d)

400 W

42.
What is the power of a 20V bulb with 5A through it?
a)
100W
b)
100V
c)
6.3W
d)
6.3A
43.

A 15-watt computer speaker is connected to a 12-volt power supply. What is the electric current running through the speaker?

a)

1.25 A

b)

0.8 A

c)

12.5 A

d)

180 A

44.
Watts is the same as...
a)
Joules per second
b)
Voltage per second
c)
Current per second
45.

If a TV draws 1.8 A of current from a 120 VAC source, what is it's resistance? What is the power? Show your work. (2pt)

a)

Write answer on back of answer sheet.

b)

Show your work.

46.

If a 120 V circuit in your home has a 15 A breaker and has a 10 ohm resistance in the circuit, will this breaker trip? Explain your answer. (2pt)

a)

Write answer on the back.

b)

Show your work.

47.

A drill dissipates 1400 W of power and uses a 120 V power source. What is the current drawn by the drill?? What is the resistance? Show your work. (2pt)

a)

Write answer on the back.

b)

Show your work.

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