EJU EJU Science: Physics - Waves and Electricity 2

Question 1

Ohm's Law states that the current through a conductor is:

Accepted Answer

Directly proportional to the voltage and inversely proportional to the resistance

Answer

Ohm's Law: I = V/R, meaning current equals voltage divided by resistance.

Question 2

Two resistors of 4Ω and 6Ω are connected in series. What is the total resistance?

Accepted Answer

10Ω

Answer

For resistors in series, total resistance R_total = R1 + R2 = 4 + 6 = 10Ω.

Question 3

Two resistors of 4Ω and 6Ω are connected in parallel. What is the total resistance?

Accepted Answer

2.4Ω

Answer

For parallel resistors, 1/R = 1/4 + 1/6 = 5/12, so R = 12/5 = 2.4Ω.

Question 4

What is electric power (P) in terms of voltage (V) and current (I)?

Accepted Answer

P = VI

Answer

Electric power is calculated as P = VI, the product of voltage and current.

Question 5

In a DC circuit, what happens to the total current when an additional resistor is added in parallel?

Accepted Answer

Total current increases because the equivalent resistance decreases

Answer

Adding a parallel branch lowers total resistance, so by I = V/R, total current from the source increases.

EJU - Examination for Japanese University Practice Test