Answers for Page 1-22:
a. rheostat and potentiometer (any order).
b. current flow in a circuit or a portion of a circuit.
c. amount of voltage applied to an electrical device, or act as voltage divider.
Resistors are rated both in ohms of resistance and maximum power (watt). The ohmic value of a resistor
is the opposition it will offer to the flow of electrons. Most resistors usually have the resistance value in ohms or
the wattage value printed or stamped on the body of the resistor.
Wattage ratings of resistors indicate the ability of a resistor to dissipate heat. This simply means how
much power (usually in the form of heat) the resistor will stand before it is damaged or destroyed.
High-wattage resistors are constructed larger in size than low-wattage resistors to provide greater surface
for dissipation of the heat created by current passing through the resistor.
1. Select from the list below, the two factors that determine the rating of a resistor. Circle the letter in
front of your answer.
a. Volts and watts
b. Amps and watts
c. Ohms and watts
d. Amps and ohms
2. Indicate which resistor shown below would have the higher power rating.
(Continued on Page 1-26)