Test: Basic Concepts - 1 - Electrical Engineering (EE) MCQ

The charge (Q) on an object can be calculated using the formula:
Q = n × e

Where:

• n = number of electrons removed = 10²⁰ electrons
• e = charge of a single electron = 1.6 × 10^-19 C

Now, substitute the values into the formula:

Therefore, the charge on the sphere is 16.02 C.

Thus, the correct answer is D: 16.02 C.

The energy (E) required to move a charge (Q) through a potential difference (V) is given by the formula:
E = Q x V

Where:

• Q = 120 coulombs
• V = 3 volts

Now, substitute the values into the formula:
E = 120 x 3 = 360 Joules

Therefore, the energy required is 360 Joules.
Answer: B: 360 J

In order for 600 C charge to be delivered to the 100 V source, the current must be anticlockwise.

Applying KVL we get

Going from 10 V to 0 V

10 + 5 + E + 1 + 0 = 0 or E =-16 V

Voltage is constant because of 15 V source.

Voltage across 60 Ω resistor = 30 V