In this post, let’s look at what’s tested in detail for current electricity for O Level physics.
I go through the points in detail in my video here.
This is a chapter with mainly calculations, hence, knowing all the formulae is essential. You can find a list of formulae for O Level Physics here. With new terms introduced e.g. current, potential difference, etc., comes the requirement to know how to define them. Find a list of definitions for O Level Physics here.
Below is a checklist of what you need to know for O Level Physics on the topic current electricity.
Checklist for Current Electricity for O Level Physics
✓ define current
✓ differences between conventional current and electron flow
✓ formula: Q = It, where Q = charge, I = current, t = time
✓ define electromotive force (e.m.f) and potential difference (p.d)
✓ formula: V = E/Q, where V is e.m.f or p.d., E. = work done or energy dissipated, Q = charge
✓ Ohms law
✓ Resistance, and how resistance is affected by length, cross sectional area, and material
✓ formula: V = IR, where V is p.d., I is current and R is resistance
✓ finding effective resistance for resistors connected in series and parallel
✓ describe experiment to determine resistance
✓ effect of temperature on resistance
✓ sketch and interpret I/V graphs for ohmic conductor, lamp and semiconductor diodes
Watch the video below to learn current electricity in detail.