Question

an electric heater works by passing a current of 100 a though a coiled metal wire, making it red hot. if the resistance of the wire is 1.1 ohms, what voltage must be applied to it?

Explanation:

Step1: Recall Ohm's Law

Ohm's Law is \(V = IR\), where \(V\) is voltage, \(I\) is current, and \(R\) is resistance.

Step2: Substitute the given values

Given \(I = 100\space A\) and \(R=1.1\space\Omega\). Substitute into the formula: \(V=(100)(1.1)\).

Step3: Calculate the voltage

\(V = 100\times1.1=110\space V\).

Answer:

\(110\space V\)