Physics: Electricity: Units
Bayani Gaba-gaba
Every circuit calculation depends on using the correct electrical units. Confusing milliamps with amps, or forgetting the relationship between volts, joules and coulombs, leads to answers that are orders of magnitude wrong.
This reference covers the seven SI units for the electricity section of the Edexcel specification: ampere, coulomb, joule, ohm, second, volt and watt.
Manufura
- Use the following units: ampere (A), coulomb (C), joule (J), ohm (Ohm), second (s), volt (V) and watt (W)
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- The SI unit of electric charge is: A) Ampere B) Coulomb C) Volt D) Ohm Answer: B
- How many amperes is 750 mA? A) 7.5 A B) 0.75 A C) 75 A D) 0.075 A Answer: B
- One volt is equivalent to: A) One joule per second B) One coulomb per second C) One joule per coulomb D) One ampere per ohm Answer: C
- What is the unit of power? A) Joule B) Coulomb C) Newton D) Watt Answer: D
- 3.3 kilohms is equal to: A) 33 ohms B) 330 ohms C) 3300 ohms D) 33000 ohms 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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