Question

the current flowing through 3 ohm resistor is 0.8 ampere, the potential drop across a 4 ohm resistor is?

Answer 1

answer : option (C)

explanation : here, you can see that 3 ohm and 6 ohm resistors are connected in parallel so, potential difference across each resistors are same.

so, potential across 6ohm = potential across 3 ohm = IR = 0.8 × 3 = 2.4 V

now, i' × 6ohm = 2.4 V

i' = 2.4/6 = 0.4 Ampere

hence, current through 6ohm resistor is 0.4 Ampere.

now, net current flows through 3ohm and 6ohm = 0.8 + 0.4 = 1.2 Ampere.

hence, 1.2 Ampere current also flows through 4 ohm.

now, potential across 4 ohm = 1.2 × 4 = 4.8 V

hence, option (C) is correct choice.

Answer 2

here you go..The answer is 4.8v