23.Resistance Review Quiz

What is the SI unit of Resistance?

• A) Ampere

• D) Watt

• B) Ohm

• C) Volt

What is the SI unit of Resistivity?

• B) Ohm metre

• A) Ohm

• C) Ampere

• D) Volt

What does Ohm's Law state?

• A) Voltage is directly proportional to current if Temperature remains constant

• C) Current is directly proportional to voltage if Temperature remains constant

• D) Resistance is indirectly proportional to current if Temperature remains constant

• All of these

What is the expression for the effective resistance of resistors in series?

• B) R = R1 * R2 * R3

• C) R = R1 / R2 / R3

• A) R = R1 + R2 + R3

• D) R = R1 - R2 - R3

What happens to the resistance of a metallic conductor as the temperature increases?

• C) It increases linearly

• B) It remains constant

• A) It decreases exponentially

• D) It increases exponentially

What is the shape of the graph of current against voltage for a conductor that obeys Ohm's Law?

• D) Sine wave

• C) Straight line passing through the origin

• B) Hyperbola

• A) Parabola

What is the purpose of a potential divider circuit?

• B) To control volume in radios

• A) To measure resistance

• D) To provide variable voltage output

• C) To measure current

What is the resistance of a conductor if the current through it is 1 A when the potential difference across it is 1 V?

• A) 1 Ω

• D) 3 Ω

• B) 2 Ω

• C) 0.5 Ω

What is the expression for the effective resistance of resistors in parallel?

• C) R = 1 / (1/R1 + 1/R2 + 1/R3)

• B) R = R1 * R2 * R3

• A) R = R1 + R2 + R3

• D) R = R1 - R2 - R3

What is the purpose of a Wheatstone Bridge?

• D) To provide variable voltage output

• C) To measure current

• B) To control volume in radios

• A) To measure an unknown resistance