Electricity and Circuits Worksheet

What is the SI unit for electric current?

• Volt

• Ohm

• Ampere

• Watt

Which formula correctly describes the relationship between current (I), potential difference (V), and resistance (R)?

• V = IR

• V = I + R

• V = I/R

• V = R/I

Which of the following is NOT an effect of an electric current?

• Chemical effect

• Heating effect

• Magnetic effect

• Gravitational effect

Why is it important to state the SI unit when describing power in an electrical system?

• It helps to compare different systems easily.

• It makes the answer longer.

• It is required only in some countries.

• It is not important at all.

Which of the following is a precautionary measure to ensure the safe use of electricity in the home?

• Overloading sockets

• Using wet hands to touch switches

• Keeping electrical appliances away from water

• Ignoring damaged wires

How can changes made to an electrical system cause hazards?

• By making the system more efficient

• By increasing the risk of electric shock or fire

• By reducing the current

• By lowering the voltage

What is the purpose of drawing and interpreting circuit diagrams?

• To make the circuit look more complicated

• To help set up and understand electrical circuits

• To decorate the classroom

• To avoid using real components

If you want to reduce the consumption of electrical energy in your household, which of the following actions would be most effective?

• Leaving lights on all night

• Using energy-efficient appliances

• Using more electrical devices

• Ignoring energy bills

A student investigates how the arrangement of fixed resistors in series or parallel affects the current in a circuit. What type of task is this?

• Recall

• Drawing

• Investigation

• Guessing

Why is it important to calculate the cost of using electrical appliances in kilowatt-hours?

• To know how much energy is consumed and manage expenses

• To make the calculation more difficult

• To confuse the user

• To increase the cost