Canada Grade 6 Science Electricity: Basic concepts of electricit

What is the basic unit of electric current?

• Volt

• Ampere

• Ohm

• Watt

Answer explanation

The basic unit of electric current is the Ampere, which measures the flow of electric charge. Other options like Volt, Ohm, and Watt refer to voltage, resistance, and power, respectively.

Which of the following materials is a good conductor of electricity?

• Rubber

• Glass

• Copper

• Wood

Answer explanation

Copper is a metal known for its excellent electrical conductivity, making it a good conductor of electricity. In contrast, rubber, glass, and wood are insulators and do not conduct electricity well.

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

• To allow electricity to flow

• To stop electricity from flowing

• To increase the voltage

• To decrease the current

Answer explanation

The purpose of an insulator in an electrical circuit is to stop electricity from flowing. Insulators prevent the flow of electric current, ensuring that electricity only travels through intended pathways.

Which of the following is an example of a simple circuit?

• A circuit with multiple paths

• A circuit with a battery, a switch, and a light bulb

• A circuit with a transformer

• A circuit with a resistor and a capacitor

Answer explanation

A circuit with a battery, a switch, and a light bulb is a simple circuit because it has a single path for current to flow, making it straightforward and easy to understand. The other options involve more complexity.

What happens to the energy in a light bulb when it is turned on?

• It is destroyed

• It is converted into light and heat

• It is stored

• It disappears

Answer explanation

When a light bulb is turned on, electrical energy is not destroyed or stored; instead, it is converted into light and heat, which is why the bulb emits light and feels warm.

Which of the following is a unit of electrical resistance?

• Volt

• Ampere

• Ohm

• Joule

Answer explanation

The unit of electrical resistance is the Ohm. It measures how much a material opposes the flow of electric current. Volt measures electric potential, Ampere measures current, and Joule measures energy.

What is the role of a switch in an electrical circuit?

• To increase the voltage

• To open or close the circuit

• To store electrical energy

• To convert electricity into light

Answer explanation

A switch in an electrical circuit serves the purpose of opening or closing the circuit, allowing or interrupting the flow of electricity. This is essential for controlling devices and ensuring safety.

Which of the following is a renewable source of energy?

• Coal

• Natural gas

• Solar power

• Oil

Answer explanation

Solar power is a renewable energy source, harnessing energy from the sun, which is inexhaustible. In contrast, coal, natural gas, and oil are fossil fuels that deplete over time and contribute to environmental issues.

What is the formula for calculating electrical power?

Answer explanation

The correct formula for calculating electrical power is P = V × I, where P is power, V is voltage, and I is current. This formula shows that power is the product of voltage and current.

Which of the following devices is used to measure electric current?

• Voltmeter

• Ammeter

• Ohmmeter

• Thermometer

Answer explanation

An ammeter is specifically designed to measure electric current in a circuit. In contrast, a voltmeter measures voltage, an ohmmeter measures resistance, and a thermometer measures temperature.