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Understanding Current and Voltage Basics

Authored by Diane Johnston

English

9th Grade

Used 4+ times

Understanding Current and Voltage Basics
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15 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the definition of electric current and its unit?

The flow of electrons; measured in volts

The flow of electric charge; measured in amperes

The potential difference between two points; measured in ohms

The resistance to the flow of charge; measured in watts

Answer explanation

Electric current is defined as the flow of electric charge, typically carried by electrons. It is measured in amperes (A), making the second answer choice correct.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the definition of voltage and its unit?

The flow of electric charge; measured in amperes

The potential difference between two points; measured in volts

The resistance to the flow of charge; measured in ohms

The power consumed by a circuit; measured in watts

Answer explanation

Voltage is defined as the potential difference between two points in an electric field, which drives the flow of electric charge. It is measured in volts, making the second answer choice the correct one.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a pro of using electric vehicles?

They have a limited range

They produce zero emissions

They have a long refuelling time

They are more expensive than petrol cars

Answer explanation

The correct choice is 'They produce zero emissions' because electric vehicles are environmentally friendly, contributing to reduced air pollution, unlike traditional petrol cars that emit harmful gases.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a con of using electric vehicles?

They produce zero emissions

They have a limited range

They are cheaper to maintain

They are quieter than petrol cars

Answer explanation

A con of using electric vehicles is that they have a limited range compared to petrol cars, which can restrict long-distance travel without frequent recharging.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the relationship between current, voltage, and resistance in a circuit?

Answer explanation

The correct relationship is given by Ohm's Law, which states that voltage (V) equals current (I) multiplied by resistance (R), expressed as V = I × R. This fundamental principle governs how electrical circuits operate.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What voltage is typically required for household appliances in Great Britain?

110V

230V

400V

800V

Answer explanation

In Great Britain, the standard voltage for household appliances is 230V. This is the voltage supplied by the electrical grid, making it the correct choice among the options provided.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why are some car manufacturers moving to 800V systems?

To increase the weight of the vehicle

To reduce charging time

To decrease the vehicle's range

To increase emissions

Answer explanation

Car manufacturers are moving to 800V systems primarily to reduce charging time. Higher voltage allows for faster charging rates, making electric vehicles more convenient and efficient for users.

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