Electric Theory Pretest

What is the standard unit of electric power?

• Volts

• Watts

• Amps

• Ohms

What is the relationship among power, current, and voltage expressed mathematically?

• power = voltage / current

• power = voltage - current

• power = voltage * current

• power = voltage + current

Which type of lighting uses a tungsten resistor coil supported in a vacuum tube to emit visible light?

• Halogen

• Fluorescent

• Incandescent

• LED

What is the purpose of a GFCI (ground fault circuit interrupter) breaker?

• To increase voltage

• To reduce resistance

• To protect humans from electric shock

• To regulate current flow

What type of power is used where large amounts of power are required and uses three hot conductors with three separate AC signals?

• Single-phase power

• Split-phase power

• Three-phase power

• Direct current power

What is the purpose of step-up transformers in the distribution of electric power?

• To protect against voltage drop

• To regulate current flow

• To increase voltage for long-distance transmission

• To reduce voltage for distribution

What is the term for electricity that flows in only one direction in a circuit?

• Three-phase power

• Split-phase power

• Alternating current

• Direct current

What is the term for the movement of wind used to drive windmills that convert motion to electric energy?

• Wind energy

• Solar energy

• Geothermal energy

• Hydropower

What is the term for the process of passing coiled conductors through a magnetic field to induce the flow of electrons?

• Nuclear fission

• Electromagnetic induction

• Chemical reaction

• Thermal conduction