Electric Theory Pretest

What is the unit of electrical resistance?

• Ampere

• Volt

• Ohm

• Watt

In a series circuit, the total resistance is:

• The sum of the individual resistances

• The reciprocal of the sum of the reciprocals of the individual resistances

• Equal to the smallest resistance

• Equal to the largest resistance

Which of the following materials is commonly used as a conductor in electrical circuits?

• Rubber

• Glass

• Copper

• Wood

Ohm's Law is represented by which of the following equations?

Which device is used to protect an electrical circuit from damage caused by overload or short circuit?

• Resistor

• Capacitor

• Circuit breaker

• Transformer

What is the purpose of a ground wire in an electrical circuit?

• To provide a path for current to return to the power source

• To increase the voltage

• To store electrical energy

• To convert AC to DC

Which of the following is a type of electrical circuit commonly used in residential applications?

• Series circuit

• Parallel circuit

• Series-parallel circuit

• All of the above