Question

Determine the current in the following circuit

• A. 1 A
• B. 2.5 A
• C. 0.4 A
• D. 3 A

Answer 1

The correct option is A 1 A

Applying KVL in the given circuit we get -2i + 10 - 5 - 3i = 0 $\Rightarrow$ i = 1A
Second Method: Similar plates of the two batteries are connected together, so the net emf = 10 – 5 = 5V
Total resistance in the circuit = 2 + 3 = $5\Omega$
$\therefore i=\frac{\sum V}{\sum R}=\frac{5}{5}=1A$