Science Double Award - 4SD0 PearsonEdexcel

Physics: Electricity: Units

Muhtasari

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.

Malengo

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

Maelezo ya Somo

Electricity problems involve current, voltage, resistance, charge, energy and power. Each has its own SI unit, and mixing them up is one of the most common sources of lost marks. This lesson gives you a single reference for all seven, along with the conversions you need when a question uses non-standard prefixes.

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Tathmini ya Somo

Hongera kwa kukamilisha somo la Physics: Electricity: Units. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.

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 SI unit of electric charge is: A) Ampere B) Coulomb C) Volt D) Ohm Answer: B
  2. How many amperes is 750 mA? A) 7.5 A B) 0.75 A C) 75 A D) 0.075 A Answer: B
  3. 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
  4. What is the unit of power? A) Joule B) Coulomb C) Newton D) Watt Answer: D
  5. 3.3 kilohms is equal to: A) 33 ohms B) 330 ohms C) 3300 ohms D) 33000 ohms Answer: C

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