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Electricity

Basics of electricity

  • 3 things to know
  • Papers 1 and 3

Overview

Current as rate of flow of charge, potential difference as work per unit charge, and resistance.

What you need to know

Answer each one before you reveal it.

Your recallNot started
Numbers

What is electric current, and how does it relate to charge and time?

Numbers

Define potential difference, give its defining equation, and state what one volt equals.

Numbers

What does W stand for in V = W/Q, and how is resistance defined?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is the definition of electric current?

    Model answer

    Electric current is the rate of flow of charge.

  2. 2

    State the formula that relates current, charge and time.

    Model answer

    I = ΔQ/Δt, where I is current in amperes, ΔQ is charge in coulombs, and Δt is time in seconds.

  3. 3

    In the equation I = ΔQ/Δt, what does the symbol ΔQ represent and what is its SI unit?

    Model answer

    ΔQ represents the charge that flows, measured in coulombs (C).

  4. 4

    What quantity does the equation I = ΔQ/Δt allow you to determine when charge flow and time interval are known?

    Model answer

    It allows you to calculate the electric current.

  5. 5

    Calculate the current when charge = 62 C, time = 11 s.

    Model answer

    Current = 62 ÷ 11 = 5.64 A.

  6. 6

    Define potential difference.

    Model answer

    Potential difference is the work done per unit charge.

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