resistors Quiz Practice Quiz | resistors

Q: What is the primary function of a resistor in an electrical circuit?

To oppose the flow of current. — Resistors impede current flow, following Ohm's Law.

Q: What is the unit of measurement for resistance?

Ohm (?) — Resistance is measured in Ohms, denoted by the Greek letter Omega.

Q: Which of the following is the formula for calculating resistance (R), given voltage (V) and current (I)?

R = V / I — Ohm's Law: Resistance equals voltage divided by current (R=V/I).

Q: What does a resistor's color code represent?

The resistor's resistance value and tolerance. — Color bands indicate resistance value and tolerance level.

Q: What is the purpose of the tolerance band on a resistor?

To indicate the allowable deviation from the stated resistance value. — Tolerance shows the percentage variation from the nominal resistance.

Q: What type of resistor has a resistance value that changes with temperature?

Thermistor — Thermistors are temperature-sensitive resistors.

Q: What is a potentiometer?

A variable resistor used to adjust voltage or current. — A potentiometer is a three-terminal variable resistor.

Q: What is the equivalent resistance of two 100-ohm resistors connected in series?

200 ohms — Series resistance adds up: 100 + 100 = 200 ohms.

Q: What is the equivalent resistance of two 100-ohm resistors connected in parallel?

50 ohms — Parallel resistance: 1/Req = 1/100 + 1/100, Req = 50 ohms.

Q: What is the power dissipated by a 100-ohm resistor carrying 2 amps of current?

400 W — Power (P) = I^2 * R = 2^2 * 100 = 400 watts.

Question 1 of 15

What is the primary function of a resistor in an electrical circuit?

Resistors impede current flow, following Ohm's Law.

Question 2 of 15

What is the unit of measurement for resistance?

Resistance is measured in Ohms, denoted by the Greek letter Omega.

Question 3 of 15

Which of the following is the formula for calculating resistance (R), given voltage (V) and current (I)?

Ohm's Law: Resistance equals voltage divided by current (R=V/I).

Question 4 of 15

What does a resistor's color code represent?

Color bands indicate resistance value and tolerance level.

Question 5 of 15

What is the purpose of the tolerance band on a resistor?

Tolerance shows the percentage variation from the nominal resistance.

Question 6 of 15

What type of resistor has a resistance value that changes with temperature?

Thermistors are temperature-sensitive resistors.

Question 7 of 15

What is a potentiometer?

A potentiometer is a three-terminal variable resistor.

Question 8 of 15

What is the equivalent resistance of two 100-ohm resistors connected in series?

Series resistance adds up: 100 + 100 = 200 ohms.

Question 9 of 15

What is the equivalent resistance of two 100-ohm resistors connected in parallel?

Parallel resistance: 1/Req = 1/100 + 1/100, Req = 50 ohms.

Question 10 of 15

What is the power dissipated by a 100-ohm resistor carrying 2 amps of current?

Power (P) = I^2 * R = 2^2 * 100 = 400 watts.

Question 11 of 15

Which of the following resistor types is adjustable?

Variable resistors (potentiometers, trimmers) allow resistance adjustment.

Question 12 of 15

What is the color code for a 1 k? resistor with 5% tolerance?

1 k? is represented as Brown-Black-Orange, Gold is the tolerance (5%).

Question 13 of 15

What does 'wattage' rating of a resistor signify?

Wattage rating specifies the maximum power dissipation capacity.

Question 14 of 15

Which of the following is a type of fixed resistor?

Carbon composition resistors have a fixed resistance value.

Question 15 of 15

If a resistor has the color bands: Brown, Green, Red, Gold, what is its value?

Brown-Green-Red is 1500 Ohms, Gold = 5% tolerance.

resistors Quiz