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Electricity and D.C. Circuits

4 dot points across 4 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

What are current, voltage, and resistance, and how does Ohm's law connect them?

Define current, potential difference, and resistance, and apply Ohm's law in calculations
A focused answer to the O-Level Physics outcome on current, voltage, and resistance. Current as the rate of flow of charge, potential difference as energy per charge, resistance, Ohm's law, and ohmic versus non-ohmic conductors.
8 min answer →

How do we calculate electrical power and energy, and how is a household circuit kept safe?

Apply the relationships for electrical power and energy and describe fuses, earthing, and circuit safety
A focused answer to the O-Level Physics outcome on electrical power, energy, and safety. The power relationships, calculating energy and cost, and the roles of fuses, earthing, and switches in keeping mains circuits safe.
8 min answer →

How do current, voltage, and resistance behave differently in series and parallel circuits?

Analyse series and parallel circuits, including combining resistances and sharing current and voltage
A focused answer to the O-Level Physics outcome on circuits. The rules for current and voltage in series and parallel, combining resistors in each arrangement, and why household appliances are wired in parallel.
8 min answer →

What is electric charge, and how do objects become charged by friction?

Describe positive and negative charge, charging by friction, and the forces between charges
A focused answer to the O-Level Physics outcome on static electricity. Positive and negative charge, charging by friction through electron transfer, the law of force between charges, and everyday effects and hazards of static.
7 min answer →