Physics - 4PH1 PearsonEdexcel

Electricity: Units

Muhtasari

Circuits involve several quantities that look similar at first glance: current, charge, voltage, resistance, energy, and power. Each has its own unit, and mixing them up is one of the fastest ways to lose marks. A solid grasp of these units turns every electricity calculation into a routine substitution.

This reference lists the seven units the Edexcel specification requires for the Electricity section: ampere, coulomb, joule, ohm, second, volt, and watt. You will learn what each one measures, how they relate to one another, and how to recall them under exam conditions.

Malengo

Use the following units: ampere (A), coulomb (C), joule (J), ohm (ohm), second (s), volt (V) and watt (W)

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Maelezo ya Somo

A useful way to picture the difference between the quantities in this section is to imagine charge as water flowing through a pipe. Current is the rate the water flows past a point, measured in litres per second; charge itself is the total amount of water that has gone past, measured in litres. Potential difference plays the role of the pressure pushing the water along, and resistance is how narrow or obstructed the pipe is. None of these analogies replace the formal definitions, but they help explain why the equations connecting the units look the way they do: rate multiplied by time gives a total amount, in exactly the same way that current multiplied by time gives charge.

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What is the SI unit of electric charge? A) A B) V C) C D) W Answer: C
Resistance is measured in: A) volts B) amperes C) watts D) ohms Answer: D
One volt is equivalent to: A) one joule per ampere B) one joule per coulomb C) one coulomb per second D) one watt per ampere Answer: B
How many milliamps are in 2.5 A? A) 0.0025 mA B) 25 mA C) 250 mA D) 2500 mA Answer: D
Which quantity is measured in watts? A) Energy B) Charge C) Power D) Resistance Answer: C

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Vitabu Vinavyopendekezwa

Pearson Edexcel International GCSE (9-1) Physics Student Book

Manukuu: First edition

Mchapishaji: Pearson Education

Mwaka: 2017

ISBN: 978-0-435-18472-2

Maelezo: Endorsed student book covering the full 4PH1 specification.

Jifunze zaidi kutoka vyanzo huria

Sehemu ya kitabu Ohm's law OpenStax · Physics
Describe how current is related to charge and time, and distinguish between direct current and alternating current

"Physics: Ohm's law" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/19-1-ohms-law. Access for free at https://openstax.org/books/physics/pages/1-introduction

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