Understanding Electrical Concepts

What is the unit of electric current?

• Ampere

• Volt

• Watt

• Ohm

What does Ohm's Law state?

• V = R / I

• I = V + R

• R = V - I

• V = I * R

What is the difference between AC and DC?

• DC can be transmitted over long distances without loss.

• AC reverses direction; DC flows in one direction.

• AC is used in batteries while DC is used in power plants.

• AC is more efficient than DC.

What is the purpose of a circuit breaker?

• To increase the voltage in electrical circuits.

• To provide a constant flow of electricity to appliances.

• To enhance the performance of electrical devices.

• To protect electrical circuits from overloads and faults.

What is voltage measured in?

• watts

• ohms

• volts

• amps

What is the function of a transformer?

• To increase the current level of direct current.

• To store electrical energy for later use.

• To convert mechanical energy into electrical energy.

• To change the voltage level of alternating current.

What is the principle of electromagnetic induction?

• A constant magnetic field can generate heat in a conductor.

• A changing electric field can induce a magnetic field in a conductor.

• The principle of electromagnetic induction states that a changing magnetic field can induce an electromotive force (EMF) in a conductor.

• Electromagnetic induction only occurs in superconductors.

What does a capacitor do in a circuit?

• A capacitor amplifies electrical signals in a circuit.

• A capacitor acts as a resistor in a circuit.

• A capacitor converts electrical energy into heat.

• A capacitor stores and releases electrical energy in a circuit.

What is the role of a resistor?

• To store electrical energy for later use.

• To increase the voltage in a circuit.

• The role of a resistor is to limit or control the flow of electrical current.

• To convert electrical energy into heat.

What safety precautions should be taken when working with electricity?

• Wear PPE, use insulated tools, avoid wet conditions, turn off power, and follow lockout/tagout procedures.

• Use metal tools for better conductivity

• Ignore power sources while working

• Work in wet conditions for cooling