Electricity: Units
Bayani Gaba-gaba
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.
Manufura
- Use the following units: ampere (A), coulomb (C), joule (J), ohm (ohm), second (s), volt (V) and watt (W)
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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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Sashen littafi
Ohm's law
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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