Electrical Power Installation Basics

What is the unit of electrical power?

• Volt

• Ampere

• Ohm

• Watt

Which of the following is a common voltage level for residential installations?

• 120 volts or 230 volts

• 12 volts

• 240 volts

• 48 volts

What is the purpose of a circuit breaker?

• To increase the voltage in electrical circuits.

• To enhance the performance of electrical devices.

• To protect electrical circuits from overloads and faults.

• To provide a constant flow of electricity to appliances.

Which type of wire is typically used for residential electrical installations?

• Aluminum wire

• Coaxial cable

• Non-metallic sheathed cable (NM cable)

• Copper wire

What does the term 'grounding' refer to in electrical systems?

• Grounding refers to the connection of an electrical system to the earth for safety and stability.

• Grounding is the process of charging an electrical system.

• Grounding is the method of increasing voltage in a circuit.

• Grounding refers to the insulation of electrical wires.

What is the primary function of a transformer?

• To convert direct current (DC) to alternating current (AC).

• To increase the frequency of electrical signals.

• To store electrical energy for later use.

• To change the voltage level of alternating current (AC) in a circuit.

Which code governs electrical installations in the United States?

• International Electrical Code (IEC)

• American Electrical Standards (AES)

• National Electrical Code (NEC)

• Federal Wiring Code (FWC)

What is the formula for calculating electrical power?

• P = V - I

• P = V × I

• P = V + I

• P = I / V

What safety equipment is essential when working with electricity?

• Hard hats and reflective vests

• Fire extinguishers and first aid kits

• Ear protection and dust masks

• Insulated gloves, safety goggles, dielectric footwear, voltage tester, and insulated tools.

What is the role of an electrician in power installation?

• To provide customer service for electrical appliances.

• To design electrical systems for commercial buildings.

• To oversee the construction of electrical power plants.

• The role of an electrician in power installation is to install and maintain electrical systems safely and efficiently.