When electrical current meets resistance, ________ is produced.

• A. Corona
• B. Heat
• C. A fault
• D. Oxidation

Answer: (B)

The concept being tested is that electrical energy is converted to heat when current passes through resistance. As electrons move through a resistor, they collide with the atoms in the material, transferring energy to the lattice and raising its temperature. The rate of this heat production is given by P = I^2R (or P = V^2/R), meaning more current or higher resistance creates more heat. This is why components warm up and why heat management is important in circuits.

Corona, a discharge in air at high voltage, is not simply the result of resistance, and a fault is an abnormal condition rather than a normal consequence of current through resistance. Oxidation is a chemical process, not the immediate electrical energy conversion happening in a resistor.