Free Current Electricity MCQs with Answers
1,052 Current Electricity MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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1,052 questions · page 31 of 53
- A. Horse power
- B. Kilowatt
- C. kWh
- D. Nm/s
Explanation: Kilowatt-hours, abbreviated as KWh, is a unit of energy representing one thousand watt-hours. And it is not a unit of power.
Correct answer: kWh- A. Gauss's law
- B. Lenz's law
- C. Pascal's law
- D. Ohm's law
Explanation: Ohm's law states that: The current passing through a conductor is directly proportional to potential difference applied across its…
Correct answer: Ohm's law- A. Halved
- B. Doubled
- C. Unchanged
- D. Quadrupled
Explanation: Length of conductor is halved, the resistance will be halved too, both are directly proportional to each other.R = L/A
Correct answer: Halved- A. DC supply only
- B. AC supply only
- C. Battery supply only
- D. All of the above options are correct
Explanation: An electric filament bulb can work on both AC (alternating current) and DC (direct current) supplies.
Correct answer: All of the above options are correct- A. 1,500 Coulombs
- B. 150 Coulombs
- C. 13,400 Coulombs
- D. 140 Coulombs
Explanation: Option B is correct since after applying the charge formula which is, Q = ITQ = 10 x 15 = 150 Columbs.
Correct answer: 150 Coulombs- A. I=VR
- B. R=VI
- C. I=R/V
- D. I=V/R
Explanation: Ohm's Law is given as V = IR which can be rearranged as I = V/R. Hence Option D is correct.
Correct answer: I=V/R- A. 150 W
- B. 300 W
- C. 50 W
- D. 100 W
Explanation: P = V2/R (where V = voltage and R = resistance) implies that the lower the resistance connected to a given voltage source, the greater the…
Correct answer: 300 W- A. Parallel
- B. Series
- C. Both
- D. None of these
Explanation: In a series circuit, the total resistance is equal to the sum of the individual resistances, Rt = R1 + R2 + R3 +......+Rn.
Correct answer: Series- A. Ve/m
- B. √(Ve/m)
- C. √(Ve/)2m
- D. √(2Ve/m)
Explanation: √(2Ve/m): This option suggests that the velocity of electrons is the square root of twice the potential difference (2V) divided by the…
Correct answer: √(2Ve/m)610. Which combinations of ten identical resistors each of 2 Ω gives rise to the resultant of 10.4 Ω?
- A. 5 Parallel, 5 Series
- B. 4 Parallel, 3 Series
- C. 3 Parallel, 4 Series
- D. 2 Parallel, 5 Series
Explanation: Use Ohm's Law to add parallel resistors. The equation is 1/RTotal = 1/R1 + 1/R2 + 1/R3 + ... + 1/RLast. Hence 5 X ½ = 5/2.
Correct answer: 5 Parallel, 5 Series- A. 6/R
- B. 3/R
- C. . R/9
- D. R/3
Explanation: Since wire with resistance R is cut in 3 equal parts therefore each part will have resistance R/3. Using: 1 𝑅 𝑇 = 1 𝑅 1 + 1 𝑅 2 +...
Correct answer: . R/9- A. 1.3 Ω
- B. 2.0 Ω
- C. 4.0 Ω
- D. 2.7 Ω
Explanation: 2.7 Ω: This option suggests that the equivalent resistance between any two corners of the triangle is 2.7 Ω.
Correct answer: 2.7 Ω- A. 2 A
- B. 4 A
- C. 6 A
- D. 1 A
Explanation: Formula V/I=R, V remains constant so if the resistance is doubled then current would be halved, V / 0.5 I=2R.
Correct answer: 1 A- A. 3R
- B. R
- C. R/3
- D. R3
Explanation: The resistors are connected in a series so the final resistance between x and y would be the sum of all resistances, R+R+R=3R.
Correct answer: 3R- A. Option A
- B. Option B
- C. Option C
- D. Option D
- E. None of the above
Explanation: (All options are wrong) R2 and R3 are connected in parallel, so their total resistances would be RT=(R2R3)/(R2+R3).
Correct answer: None of the above- A. 1 A
- B. 15 A
- C. 4 A
- D. 10 A
Explanation: The total voltage, in this case, will be 6+6=12V; R=3 ohms I=V/R=12/3= 4A. As it is a numerical, it can have only one possible answer.
Correct answer: 4 A617. Three 6 Ω are connected as shown in the diagram What is the resistance between points 'A' and 'B'
- A. 6 Ω
- B. 16 Ω
- C. 4 Ω
- D. 2 Ω V
Explanation: If looked into closely, these resistors are actually parallel to each other.
Correct answer: 2 Ω V- A. 12 V
- B. 6 V
- C. 1 V
- D. 3 V
Explanation: To determine the potential difference required across a 6-ohm resistance to achieve a steady current of one ampere, we can use Ohm's law…
Correct answer: 6 V- A. Product of the reciprocals of the individual resistances
- B. Sum of the reciprocals of the individual resistances
- C. Product of the individual resistances
- D. Sum of the individual resistances
Explanation: Resistors are said to be in series when equal current flows through each resistor because there is only one path for the charges to flow…
Correct answer: Sum of the individual resistances- A. 5%
- B. 12%
- C. 10%
- D. 13%
Explanation: the resistances are R1=6Ω and R2=4Ω. Tolerance in the resistances: ΔR1=.6Ω ΔR2 =.4Ω The total resistance of the combination…
Correct answer: 10%