Question

A bulb is rated 5.0 v 100ma calculate its rated power and resistance

Answer 1

P = V I = 5.0 * 100E-3 = 500E-3 W or 0.50 watts 

R = V/I = 5.0 / 0.100 = 50 ohms

Answer 2

Answer:

Power = 0.5 W

Resistance = 50 Ω

Explanation:

Given :-

Potential difference (V) = 5V

Current (I) = 100mA = 100/1000A = 0.1A

To find :-

Power (P)

Resistance (R)

Solution :-

From Ohm's law (V = IR)

• 5 = 0.1 × R
• R = 5/0.1
• R = 5/(1/10)
• R = 5 × 10
• R = 50 Ω

Power (P) = V²/R

• P = 5²/50
• P = 25/50
• P = 1/2
• P = 0.5 W