Question Bank for Grade 7 Science

What is voltage?

• The amount of energy used by a circuit

• The measure of the electrical potential difference between two points in a circuit

• The flow of electric charge through a circuit

• The measure of how much a material or device opposes the flow of electric current

Answer explanation

Voltage is a measure of the electric force that pushes electric charge, like tiny particles called electrons, through a wire or a circuit. You can think of it like water pressure in a hose, where the voltage is the force that pushes the water through the hose. In the case of electricity, the voltage is the force that pushes the electrons through a wire. The higher the voltage, the stronger the force, and the more energy the electrons have to do work, like lighting up a bulb or powering a device.

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Voltage

What is the unit of measurement for voltage?

• Watts (W)

• Amperes (A)

• Volts (V)

• Ohms (Ω)

Answer explanation

Volts (V) measure voltage. Amps measure Current (I), Ohms (Ω) measure Resistance. V=IR

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Voltage

What provides voltage in a circuit?

• Inductors

• Battery or power supply

• Resistors

• Capacitors

Answer explanation

A battery provides voltage by storing chemical energy and converting it into electrical energy. When you connect a battery to a device, like a flashlight, a chemical reaction happens inside the battery. One end releases tiny particles called electrons, which flow through the device and create an electric current. The other end then absorbs these electrons. This flow of electrons from the negative end to the positive end is what we call voltage. The voltage is what powers the device and makes it work.

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Voltage

Energy Source

What is resistance?

• The measure of how much a material or device opposes the flow of electric current
• The flow of electric charge through a circuit
• The measure of the electrical potential difference between two points in a circuit
• The amount of energy used by a circuit

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Resistance

What is the unit of measurement for resistance?

• Volts (V)
• Ohms (Ω)
• Watts (W)
• Amperes (A)

Tags

Resistance

What is current?

• The flow of electric charge through a circuit
• The measure of how much a material or device opposes the flow of electric current
• The amount of energy used by a circuit
• The measure of the electrical potential difference between two points in a circuit

Tags

Current

Which terminal do electrons flow FROM in a circuit?

• Positive terminal

• Neither terminal

• Both terminals

• Negative terminal

Answer explanation

Electrons are negative and like charges repel, so they are repelled from the negative end of the battery.

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Charge

What affects the flow of current in a circuit?

• Voltage only
• Resistance only
• Neither voltage nor resistance
• Both voltage and resistance

Tags

Resistance

Voltage

What will a higher voltage result in?

• A greater flow of current through the circuit

• No change in the flow of current through the circuit

• A change in the resistance of the circuit

• A lower flow of current through the circuit

Answer explanation

A higher voltage will result in a greater flow of current through the circuit because voltage is the force that pushes electric charge through a conductor. When there is more voltage, it means there is a stronger force pushing the charges, which leads to a higher flow of current.

Tags

Voltage

Current

What will a higher resistance result in?

• A slower flow of current through the circuit

• No change in the flow of current through the circuit

• A change in the voltage of the circuit

• A faster flow of current through the circuit

Answer explanation

A higher resistance will result in a slower flow of current through the circuit because resistance is the measure of how much a material or device opposes the flow of electric current. When there is more resistance, it means that the material or device is making it more difficult for the electric charges to flow, which leads to a slower flow of current.

Tags

Resistance