Physics: Magnetism And Electromagnetism: Units
Muhtasari
An electromagnet, a loudspeaker and an electric motor are all described by just three units: the ampere, the volt and the watt. Between them they answer how much charge is flowing, how hard it is being pushed, and how fast energy is being delivered.
In this lesson you will meet each of the three, see how the volt and the watt are built out of simpler units, practise the prefix conversions that appear on every device label, and use units as a quick check that a calculation has been set up the right way round.
Malengo
- Use the following units: ampere (A), volt (V) and watt (W)
Maelezo ya Somo
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- The SI unit of electric current is the: A) Volt B) Watt C) Ampere D) Coulomb Answer: C
- One volt is the same as: A) One joule per second B) One joule per coulomb C) One coulomb per second D) One watt per second Answer: B
- A device works at 12 V and draws 3 A. Its power is: A) 4 W B) 9 W C) 15 W D) 36 W Answer: D
- 250 mA expressed in amperes is: A) 0.025 A B) 0.25 A C) 2.5 A D) 250 000 A Answer: B
- One watt is the same as: A) One joule per coulomb B) One joule per second C) One coulomb per second D) One volt per ampere Answer: B
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Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
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