Electric heaters are usually composed of:

Electric heaters are usually composed of:

• A. Rectifiers
• B. Resistors
• C. Inductances
• D. Capacitors

Answer: (B)

Electric heaters rely on resistive heating: when electric current passes through a conductor with resistance, I^2R losses turn electrical energy into heat. The heating element is essentially a resistor chosen for its ability to heat up reliably and safely. Materials like nichrome are used because they have high resistivity and good high‑temperature stability, so a relatively small piece of wire can produce a lot of heat without deteriorating quickly. The power turned into heat follows P = I^2R (or P = V^2/R), so the design aims for a resistance that gives the desired heat at the supply voltage. Rectifiers would change the type of current, not produce heat as the primary function. Inductances and capacitors are primarily for storing energy or shaping signals and can heat only through undesired losses, not as efficient, controlled heating elements. That’s why the heating element in most electric heaters is a resistor.

Electric heaters rely on resistive heating: when electric current passes through a conductor with resistance, I^2R losses turn electrical energy into heat. The heating element is essentially a resistor chosen for its ability to heat up reliably and safely. Materials like nichrome are used because they have high resistivity and good high‑temperature stability, so a relatively small piece of wire can produce a lot of heat without deteriorating quickly. The power turned into heat follows P = I^2R (or P = V^2/R), so the design aims for a resistance that gives the desired heat at the supply voltage.

Rectifiers would change the type of current, not produce heat as the primary function. Inductances and capacitors are primarily for storing energy or shaping signals and can heat only through undesired losses, not as efficient, controlled heating elements. That’s why the heating element in most electric heaters is a resistor.