Resistance Flashcards
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.
D. Gold, Silver.
What is the purpose of the bands in a 4-band resistor, name each one:
1st band =______
2nd band =______
3rd band =______
4th band =______
1st band = First Digit
2nd band = Second Digit
3rd band = Multiplier
4th band = Tolerance
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%
B. 260 Ohms ±10%
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%
C. 3,700,000 Ohms (3.7M Ohms) ±5%
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. 48 Ohms ±20%
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%
D. 92,000 Ohms (92k Ohms) ±5%
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%
B. 1,300 Ohms (1.3k Ohms) ±20%
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
C.
Series: Rt = R1 + R2 + Rn
Parallel: 1/Rt = 1/R1 + 1/R2 + 1/Rn
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
D. 0 or Very little
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. Infinite or Very High
What will the ohmmeter read in the circuit schematic?
A. 20 ohms
B. 40 ohms
C. 10 ohms
D. 60 ohms
C. 10 ohms