Variable resistors have problems with the wiper making contact.

More Questions from Resistance and Power

• A 12-volt battery is delivering 3 amperes to a resistor. The power dissipated by the resistor is 4 watts.
• Fixed-value resistors can internally short-circuit.
• A load resistance is the resistance of the load.
• Resistance is inversely proportional to current.
• A resistor with a value of 9.9 kΩ 10% could have a value between 8.91 kΩ and 10.89 kΩ.
• An ohmmeter uses an internal battery to measure the resistance of a resistor.
• Resistivity is measured in cmil.Ω/ft.
• One horsepower is 746 watts.
• A rheostat is not a type of variable resistor.
• If 500 mA is flowing through a 10 Ω resistor, the wattage rating of the resistor should be 2 watts.

Discussion & Comments