Physics

Current Electricity and Circuits

450 Questions

Current electricity and circuits questions cover resistors, EMF, internal resistance, and power calculations in series and parallel configurations. Solving these builds a strong understanding of electrical principles and circuit analysis. These physics problems are highly relevant for technical and science aptitude tests.

Resistor combinationsPower dissipationEMF and internal resistanceAC circuit analysisOperational amplifiers

Current Electricity and Circuits Questions

Multiple choice

The positive terminal of a cell is represented by

  1. long horizontal line

  2. long vertical line

  3. short horizontal line

  4. short vertical line

  5. two parallel lines
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yes, it is correct. The two parallel lines represent the cell from which the long vertical line shows the positive terminal.

Multiple choice

Ohm's law represents the graph as

  1. parabolic

  2. linear

  3. hyperbolic

  4. sine

  5. cosine
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ratio of V/I is constant and when current is plotted as a function of voltage the curve is linear (a straight line).

Multiple choice

If a circuit containing two unequal resistors is connected in parallel then _____________.

  1. the voltage is same across both the resistors

  2. the current is same and voltage is different in the resistance having more value

  3. the current is same in both resistors

  4. the current is flow less in both resistors

  5. the voltage drops are different across both the resistors
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If one of the parallel resistors shorted out, then the voltage across all of them would be zero (short) volts. Since,  the voltage across the other resistors is zero, the current would also be zero.