a. how much current will an eletric blub draw from a 220v source ,if the resistance of the bulb filament is 1200 ohm ? b. how much current will an eletric heater coil draw from a 220v source ,if the resistence of the heater coil is 100 ohm?
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Potential Difference ,V = 220V
Resistance ,R = 1200Ω
Resistance of Heater Coil = 100Ω
Current in both Case ,I
Using Ohm's Law
• V = IR
Where,
V is the Voltage
I is the Current
R is the resistance.
For Bulb
V = IR
Substitute the value we get
➺ 220 = I × 1200
➺ I =
→ I = 0.18 A
Therefore, the current flow in the bulb is 0.18 Ampere.
For Electric Heater
V = IR
➺ I =
Substitute the value we get
➺ I =
➺ I = 2.2 A
Therefore, the current flow in the bulb is 2.2 Ampere.
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