Question

In the circuit shown below, the safe maximum value for the current I is

• A. 0.5 A
• B. 0.1 A
• C. 1.0 A
• D. 0.05 A

Answer 1

The correct option is B 0.1 A

Maximum current for 100$\Omega$, 1 W;

$I=\sqrt{\frac{P}{R}}=0.1A$

Maximum current for 2$\Omega$, 0.5 W;

$I=\sqrt{\frac{0.5}{2}}=0.5A$

Maximum current for 1$\Omega$, 0.25 W;

$I=\sqrt{0.25}=0.5A$

The safe maximum value of current I which can flow through series resistances is 0.1 A