EIM Grade 7 Summative Test

What is the purpose of electrical grounding?

• To provide a safe path for electrical current to flow into the ground and prevent electrical shock.

• To reduce the efficiency of electrical appliances.

• To increase the voltage of electrical current.

• To prevent electrical fires.

What is the difference between a series circuit and a parallel circuit?

• The main difference is the voltage across the components.

• The main difference is the power consumption of the components.

• The main difference is how the components are connected and how the current flows.

• The main difference is the resistance of the components.

What is the function of a circuit breaker?

• The function of a circuit breaker is to protect electrical circuits from damage caused by excessive current.

• The function of a circuit breaker is to regulate the voltage in electrical circuits.

• The function of a circuit breaker is to generate electricity.

• The function of a circuit breaker is to control the flow of electricity.

What is the role of an insulator in an electrical circuit?

• An insulator increases the flow of electric current.

• An insulator generates electric current.

• An insulator has no effect on the flow of electric current.

• An insulator prevents the flow of electric current.

What is the formula to calculate electrical power?

• P = VI

• P = V / I

• P = I^2 * R

• P = V^2 / R

What are the safety precautions to be followed while working with electrical equipment?

• Working on live equipment without turning off the power

• Wearing appropriate PPE, ensuring proper grounding, using insulated tools, avoiding water, and turning off power before working on the equipment.

• Not wearing any protective gear

• Using wet hands while working with electrical equipment

What is the purpose of a fuse in an electrical circuit?

• The purpose of a fuse in an electrical circuit is to generate electricity for the circuit.

• The purpose of a fuse in an electrical circuit is to protect the circuit from excessive current.

• The purpose of a fuse in an electrical circuit is to increase the voltage in the circuit.

• The purpose of a fuse in an electrical circuit is to regulate the flow of current.

What is the difference between AC (Alternating Current) and DC (Direct Current)?

• AC periodically changes direction, while DC flows in only one direction.

• AC and DC both flow in multiple directions.

• AC and DC are the same thing.

• AC flows in only one direction, while DC periodically changes direction.

What is the role of a transformer in an electrical system?

• The role of a transformer in an electrical system is to regulate the voltage in a circuit.

• The role of a transformer in an electrical system is to generate electrical energy from heat.

• The role of a transformer in an electrical system is to convert electrical energy into mechanical energy.

• The role of a transformer in an electrical system is to transfer electrical energy between circuits through electromagnetic induction.

What are the common electrical hazards and how can they be prevented?

• Not wearing protective gear.

• Ignoring safety precautions.

• Using electrical equipment improperly.

• Following safety precautions and using electrical equipment properly.