Science Double Award - 4SD0 PearsonEdexcel

Physics: Magnetism And Electromagnetism: Units

Muhtasari

The magnetism and electromagnetism section draws on just three units, but each appears in key equations linking current, voltage and power in electromagnetic devices.

This reference covers the three SI units for this section: ampere, volt and watt, along with the contexts in which they appear in magnetism and electromagnetism questions.

Malengo

  1. Use the following units: ampere (A), volt (V) and watt (W)

Maelezo ya Somo

Magnetism questions are more qualitative than most physics topics in the Double Award specification - field patterns, poles, attraction and repulsion are described in words and diagrams rather than calculated. But once a question moves from a permanent magnet to an electromagnet, a motor or a generator, numbers start appearing: the current in a coil, the voltage a device runs on, the power it delivers. These three units are the complete list the specification requires for this section, and every calculation question in magnetism and electromagnetism draws only on these.

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Tathmini ya Somo

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Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.

Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.

  1. The unit of current is: A) Volt B) Watt C) Ampere D) Ohm Answer: C
  2. A device draws 0.5 A from a 230 V supply. Its power is: A) 460 W B) 115 W C) 230.5 W D) 0.002 W Answer: B
  3. Induced voltage in a generator is measured in: A) Amperes B) Volts C) Watts D) Ohms Answer: B
  4. What is 200 mA in amperes? A) 20 A B) 2 A C) 0.2 A D) 0.02 A Answer: C
  5. Power is calculated using: A) P = V/I B) P = IR C) P = IV D) P = I/V Answer: C

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