Electricity

What you'll learn

• Understand that an electric current is a flow of charge carriers.
• Understand that the charge on charge carriers is quantised.
• Recall and use Q = It.
• Use, for a current-carrying conductor, the expression I = Anvq.
• Define the potential difference across a component as the energy transferred per unit charge.
• Recall and use P = VI, P = I^2R and P = V^2/R.
• Sketch the I–V characteristics of a metallic conductor at constant temperature, a semiconductor diode and a filament lamp.
• Explain that the resistance of a filament lamp increases as the current increases because its temperature increases.

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