Can You Decode Resistor Color Codes?

1.

The resistor has 4 bands. Red, Green, Blue, Gold Which answer is correct?

A.

25K Ohms with a 5% Tolerance and a 2.5K Ohm tolerance range
B.

25M Ohms with a 5% Tolerance and a 2.5M Ohm tolerance range
C.

6.5k Ohms with a 5% Tolerance and a 650 Ohm tolerance range
D.

2500 Ohms with a 10% Tolerance and a 500 Ohm tolerance range
E.

25M Ohms with a 10% Tolerance and a 5M Ohm tolerance range

Correct Answer
B. 25M Ohms with a 5% Tolerance and a 2.5M Ohm tolerance range

Explanation
The correct answer is 25M Ohms with a 5% Tolerance and a 2.5M Ohm tolerance range. This is because the resistor has 4 bands, and the color code for the first three bands (Red, Green, Blue) corresponds to the value of 25M Ohms. The fourth band (Gold) indicates a tolerance of 5%, meaning the actual resistance value can vary within 5% of the stated value. The 2.5M Ohm tolerance range indicates that the resistance can vary by +/- 2.5M Ohms.

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2.

The resistor has 4 bands. Green, Blue, Red, Silver Which answer is correct?

A.

56K Ohms with a 5% Tolerance and a 2.5K Ohm tolerance range
B.

5.6K Ohms with a 5% Tolerance and a 560 Ohm tolerance range
C.

56K Ohms with a 10 Tolerance and a 11.2K Ohm tolerance range
D.

5.6K Ohms with a 10% Tolerance and a 1120 Ohm tolerance range
E.

560 Ohms with a 5% Tolerance and a 56 Ohm tolerance range

Correct Answer
D. 5.6K Ohms with a 10% Tolerance and a 1120 Ohm tolerance range

Explanation
The resistor has 4 bands, which means it is a 4-band resistor. The colors of the bands are green, blue, red, and silver. By decoding the colors using the resistor color code, we can determine the resistance value, tolerance, and tolerance range. The colors green, blue, and red correspond to the digits 5, 6, and 0, respectively. The silver band represents a multiplier of 0.01. Therefore, the resistance value is 56K Ohms (56000 Ohms). The green band indicates a tolerance of 5%, and the blue band indicates a multiplier of 10. Therefore, the correct answer is 5.6K Ohms with a 10% Tolerance and a 1120 Ohm tolerance range.

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3.

The resistor has 4 bands. Yellow, Brown, Brown, Gold Which answer is correct?

A.

110k Ohms with a 5% Tolerance and a 11k Ohm tolerance range
B.

410 Ohms with a 10% Tolerance and a 82 Ohm tolerance range
C.

110k Ohms with a 10% Tolerance and a 22k Ohm tolerance range
D.

4.1k Ohms with a 5% Tolerance and a 205 Ohm tolerance range
E.

410 Ohms with a 5% Tolerance and a 41 Ohm tolerance range

Correct Answer
D. 4.1k Ohms with a 5% Tolerance and a 205 Ohm tolerance range

Explanation
Resistors use a color-coding system to indicate their resistance value and tolerance. Each band on the resistor represents a specific digit or multiplier.
First band: Yellow (4) - Represents the first significant digit.
Second band: Brown (1) - Represents the second significant digit.
Third band: Brown (1) - Represents the multiplier (10^1 = 10).
Fourth band: Gold (5%) - Represents the tolerance.
Therefore, the resistor has a value of 41 x 10 = 410 Ohms with a 5% tolerance.
To calculate the tolerance range:
Tolerance: 5% of 410 Ohms = 20.5 Ohms
The actual resistance value can vary between:
Lower limit: 410 Ohms - 20.5 Ohms = 389.5 Ohms
Upper limit: 410 Ohms + 20.5 Ohms = 430.5 Ohms

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4.

The resistor has 4 bands. Brown, Back, Red, Gold Which answer is correct?

A.

100 Ohms with a 1% Tolerance and a 2 Ohm tolerance range
B.

1000 Ohms with a 5% Tolerance and a 100 Ohm tolerance range
C.

10k Ohms with a 5% Tolerance and a 1K Ohm tolerance range
D.

1000 Ohms with a 10% Tolerance and a 200 Ohm tolerance range
E.

100 Ohms with a 20% Tolerance and a 40 Ohm tolerance range

Correct Answer
B. 1000 Ohms with a 5% Tolerance and a 100 Ohm tolerance range

Explanation
The given answer is correct because the resistor has a brown band as the first digit, which represents the number 1. The second band is black, representing the second digit 0. The third band is red, representing a multiplier of 100, and the fourth band is gold, representing a tolerance of 5%. Therefore, the resistor value is 1000 Ohms with a 5% tolerance. The tolerance range is calculated by multiplying the resistance value by the tolerance percentage, so in this case, the range is 100 Ohms.

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5.

What is the resistivity of copper?

A.

5.6x10-8
B.

2.65x10-8
C.

1.724x10-8
D.

None of the above

Correct Answer
C. 1.724x10-8

Explanation
Copper exhibits a low electrical resistivity of 1.724x10-8. This small value reflects its exceptional conductivity, with abundant free electrons facilitating efficient flow of electric current. This property makes copper a vital material in various electrical applications, including wiring and conductors.

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6.

How is a fully functional 3.9 k ohms resistor color coded?

A.

Red, green, orange, silver
B.

Orange, green, orange, silver
C.

Red, white, red, gold
D.

Orange, white, red, gold

Correct Answer
D. Orange, white, red, gold

Explanation
The color code for a 3.9 k ohms resistor is orange, white, red, gold. The first band, orange, represents the digit 3. The second band, white, represents the digit 9. The third band, red, represents the multiplier 100. Therefore, the resistance value is calculated as (39 x 100) = 3,900 ohms, which is equivalent to 3.9 k ohms. The fourth band, gold, represents the tolerance of the resistor, indicating that the actual resistance can vary by +/- 5%.

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7.

The electrical component that is designed to resist the flow of the current?

A.

Insulators
B.

Resistors
C.

Conductors
D.

None of the above

Correct Answer
B. Resistors

Explanation
Resistors are electrical components specifically designed to resist the flow of current in a circuit. They are made of materials with high resistance, such as carbon or metal alloys, which limit the flow of electrons. By providing resistance, resistors help control the amount of current flowing through a circuit and protect other components from excessive current. Unlike conductors, which allow easy passage of current, and insulators, which prevent the flow of current altogether, resistors offer a controlled level of resistance to regulate the flow of electricity.

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8.

What is the resistance value of a resistor with the following color bands: Red, Violet, Orange, Gold?

A.

270 ohms ± 5%
B.

27,000 ohms ± 5%
C.

2,700,000 ohms ± 5%
D.

27 ohms ± 5%

Correct Answer
C. 2,700,000 ohms ± 5%

Explanation
Resistors use color bands to indicate their resistance value and tolerance. Each color corresponds to a number. The first two bands are digits, the third is a multiplier, and the fourth is the tolerance. In this case, Red is 2, Violet is 7, making it 27. Orange is a multiplier of 1000, resulting in 27 x 1000 = 27,000 ohms. Gold signifies a ±5% tolerance, meaning the actual resistance can vary by 5% of 27,000 ohms.

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9.

If the resistance of the system decreases, what happens to the current?

A.

It stays the same
B.

It decreases
C.

It increases
D.

None of the above

Correct Answer
C. It increases

Explanation
When the resistance of a system decreases, according to Ohm's Law (V = IR), the current increases. This is because as resistance decreases, there is less opposition to the flow of electric current. Therefore, more current can flow through the system.

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