Electricity and Simple Circuits — O/L Science

What must I remember about Electricity and Simple Circuits?

• Current I (Amp) = charge Q / time t; Q = It
• Ohm's Law: V = IR (voltage = current × resistance)
• Series circuit: same current; voltages add; resistances add
• Parallel circuit: same voltage; currents add; 1/R_total = 1/R₁ + 1/R₂ ...
• Electrical power P = IV = I²R = V²/R; Energy = Pt

Test yourself (1 minute)

1. Power

   P = IV = I²R = V²/R; unit = Watt (W)

2. Series

   same I throughout; V_total = V₁ + V₂; R_total = R₁ + R₂

3. Parallel

   same V across branches; I_total = I₁ + I₂; 1/R_total = 1/R₁ + 1/R₂

Practise Electricity and Simple Circuits questions today

Must know

• Household wiring = parallel (each appliance gets full voltage)
• Fuse/circuit breaker: protects circuit from excess current

Source: NIE O/L Science — Unit 8: Electricity and Circuits

What comes next?

Next in the syllabus

Where does Electricity and Simple Circuits fit in the syllabus?

Grade 10 · Term 3 · Grade 11 · Term 1