Question

*How much current will an electric bulb draw from a 220 V source, if the resistance of the bulb filament is 440 ohm (Ω)?* 1️⃣ 0.5 A 2️⃣ 1.0 A 3️⃣ 1.5 A 4️⃣ 2.0 A​

Answer 1

Provided that:

• Resistance = 440 Ω
• Voltage = 220 V

To calculate:

• Current

Solution:

• Current = 0.5 A

We know that,

• Current = Voltage / Resistance

Required solution:

»»» Current = Voltage / Resistance

»»» I = V/R

»»» Current = 220 V / 440 Ω

»»» Current = 22 V / 44 Ω

»»» Current = 2 V / 4 Ω

»»» Current = 1 V / 2 Ω

»»» Current = 0.5 A $\:$

• Therefore, current = 0.5 Ampere. Henceforth, option (a) is correct!