Resistance Flashcards

1
Q

What two colors are NEVER found as the first band of a resistor?
A. Red, Green.
B. Blue, Violet.
C. Black, Brown.
D. Gold, Silver.

A

D. Gold, Silver.

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2
Q

What is the purpose of the bands in a 4-band resistor, name each one:
1st band =______
2nd band =______
3rd band =______
4th band =______

A

1st band = First Digit
2nd band = Second Digit
3rd band = Multiplier
4th band = Tolerance

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3
Q

What is the value of this resistor?
Colors: Red, Blue, Brown, Silver
A. 260 Ohms ±5%
B. 260 Ohms ±10%
C. 625 Ohms ±10%
D. 625 Ohms ±5%

A

B. 260 Ohms ±10%

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4
Q

What is the value of this resistor?
Colors: Orange, Violet, Green, Gold
A. 370,000 Ohms (370k Ohms) ±5%
B. 37,000 Ohms (37k Ohms) ±10%
C. 3,700,000 Ohms (3.7M Ohms) ±5%
D. 3,700 Ohms ±10%

A

C. 3,700,000 Ohms (3.7M Ohms) ±5%

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5
Q

What is the value of this resistor?
Colors: Yellow, Grey, Black, None
A. 48 Ohms ±20%
B. 48 Ohms ±5%
C. 480 Ohms ±20%
D. 4.8 Ohms ±20%

A

A. 48 Ohms ±20%

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6
Q

What is the value of this resistor?
Colors: White, Red, Orange, Gold
A. 9,200 Ohms (9.2k Ohms) ±5%
B. 920,000 Ohms (920k Ohms) ±5%
C. 920 Ohms ±5%
D. 92,000 Ohms (92k Ohms) ±5%

A

D. 92,000 Ohms (92k Ohms) ±5%

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7
Q

What is the value of this resistor?
Colors: Brown, Orange, Red, None
A. 13,000 Ohms (13k Ohms) ±20%
B. 1,300 Ohms (1.3k Ohms) ±20%
C. 130 Ohms ±20%
D. 13 Ohms ±20%

A

B. 1,300 Ohms (1.3k Ohms) ±20%

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8
Q

What is the formula for resistors in a SERIES and PARALLEL circuit?
A.
Series: Rt = R1 x R2 x Rn
Parallel: Rt = R1 + R2 + Rn
B.
Series: Rt = 1/R1 + 1/R2 + 1/Rn
Parallel: Rt = R1 + R2 + Rn
C.
Series: Rt = R1 + R2 + Rn
Parallel: 1/Rt = 1/R1 + 1/R2 + 1/Rn
D.
Series: Rt = R1/R2/Rn
Parallel: Rt = R1 x R2 x Rn

A

C.
Series: Rt = R1 + R2 + Rn
Parallel: 1/Rt = 1/R1 + 1/R2 + 1/Rn

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9
Q

What is the resistance of a closed switch or a good wire?
A. High or Infinite
B. Moderate or Adjustable
C. Variable or Dependent on Temperature
D. 0 or Very little

A

D. 0 or Very little

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10
Q

What is the resistance of a blown resistor, or an open circuit breaker?
A. Infinite or Very High
B. Zero or Negligible
C. Moderate or Controllable
D. Low or Variable

A

A. Infinite or Very High

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11
Q

What will the ohmmeter read in the circuit schematic?
A. 20 ohms
B. 40 ohms
C. 10 ohms
D. 60 ohms

A

C. 10 ohms

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