Ohms Law
Q. In a series circuit, if one resistor fails open, what happens to the current in the circuit?
A.
It increases
B.
It decreases
C.
It becomes zero
D.
It remains the same
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Solution
In a series circuit, if one resistor fails open, the current becomes zero because the circuit is broken.
Correct Answer: C — It becomes zero
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Q. In a series circuit, if one resistor is removed, what happens to the total resistance?
A.
It increases.
B.
It decreases.
C.
It remains the same.
D.
It becomes zero.
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Solution
In a series circuit, removing a resistor decreases the total resistance because the total resistance is the sum of all resistances.
Correct Answer: B — It decreases.
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Q. What does Ohm's Law state?
A.
Voltage is directly proportional to current
B.
Current is directly proportional to resistance
C.
Resistance is directly proportional to voltage
D.
Voltage is inversely proportional to current
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Solution
Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points, which can be expressed as V = IR.
Correct Answer: A — Voltage is directly proportional to current
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Q. What happens to the current in a circuit if the resistance is increased while the voltage remains constant?
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
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Solution
According to Ohm's Law, if resistance increases while voltage remains constant, the current decreases.
Correct Answer: B — It decreases
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Q. What happens to the current in a circuit if the voltage is tripled and the resistance remains constant?
A.
It triples
B.
It doubles
C.
It halves
D.
It remains the same
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Solution
According to Ohm's Law, if voltage (V) is tripled and resistance (R) remains constant, the current (I) will also triple: I = V / R.
Correct Answer: A — It triples
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Q. What happens to the resistance of a conductor if its temperature increases?
A.
It decreases.
B.
It increases.
C.
It remains the same.
D.
It becomes zero.
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Solution
For most conductors, resistance increases with an increase in temperature due to increased atomic vibrations.
Correct Answer: B — It increases.
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Q. What happens to the total resistance in a series circuit when more resistors are added?
A.
It decreases.
B.
It remains the same.
C.
It increases.
D.
It becomes zero.
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Solution
In a series circuit, the total resistance increases as more resistors are added.
Correct Answer: C — It increases.
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Q. What is the equivalent resistance of two resistors, 6 ohms and 3 ohms, connected in series?
A.
2 ohms
B.
3 ohms
C.
9 ohms
D.
18 ohms
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Solution
In series, the equivalent resistance is the sum: R_eq = R1 + R2 = 6Ω + 3Ω = 9Ω.
Correct Answer: C — 9 ohms
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Q. What is the equivalent resistance of two resistors, 6Ω and 3Ω, connected in series?
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Solution
In series, the equivalent resistance (R_eq) is the sum of the resistances: R_eq = 6Ω + 3Ω = 9Ω.
Correct Answer: C — 9Ω
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Q. What is the relationship between voltage, current, and resistance according to Ohm's Law?
A.
V = I * R
B.
V = I / R
C.
V = R / I
D.
V = I + R
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Solution
Ohm's Law states that the voltage (V) across a conductor is directly proportional to the current (I) flowing through it, with resistance (R) as the proportionality constant: V = I * R.
Correct Answer: A — V = I * R
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Q. What is the relationship between voltage, current, and resistance in a circuit according to Ohm's Law?
A.
V = I + R
B.
V = I - R
C.
V = I * R
D.
V = I / R
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Solution
According to Ohm's Law, the relationship is given by V = I * R.
Correct Answer: C — V = I * R
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Q. What is the unit of resistance in the SI system?
A.
Volt
B.
Ampere
C.
Ohm
D.
Watt
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Solution
The unit of resistance in the SI system is the Ohm (Ω).
Correct Answer: C — Ohm
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Q. What is the unit of resistance?
A.
Volt
B.
Ampere
C.
Ohm
D.
Watt
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Solution
The unit of resistance is Ohm, which is defined as the resistance between two points when a constant potential difference of one volt produces a current of one ampere.
Correct Answer: C — Ohm
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Q. Which of the following materials is typically a good conductor of electricity?
A.
Rubber
B.
Copper
C.
Glass
D.
Wood
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Solution
Copper is a good conductor of electricity, while rubber, glass, and wood are insulators.
Correct Answer: B — Copper
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