Question

how much current will an electric heater coil draw from a 220 v source if the resistance of the heater coil is 100 ohm

Answer 1

using v = ir where v is voltage, i is current and r is resistance,
220 v = i * 100
therefore i = 220/100  =  2.2 amperes.

Answer 2

Answer: The correct answer is 2.2A current an electric heater coil will draw from a 220V source if the resistance of the heater coil is 100Ω.

Explanation:

It is given in the question itself that
source voltage V = 220V,
Resistance of heater coil R=100Ω.
Now, by using Ohm's law V=IR where V is the voltage, R is the resistance and I is the current drawn
⇒V= IR

∴I=V/R=22V/100Ω=2.2A

Hence, 2.2A current will an electric heater coil draw from a 220V source if the resistance of the heater coil is 100Ω.

• When various electrical devices with various resistances are connected independently to the same source, they each draw a different amount of current.
• Ohm's Law is particularly helpful when resistance needs to be computed because it cannot be measured in an active circuit.
• The aforementioned application of Ohm's Law allows a technician to calculate R without having to turn the circuit off to measure resistance.

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