top of page
  • Writer's pictureTerence Pang

Important Formulae to remember for O Levels Physics Electricity Topics

Here are some important formulae related to electricity for O Levels Physics Singapore:

  1. Electrical Energy (E) = Power (P) x Time (t) E = P x t

  2. Power (P) = Voltage (V) x Current (I) P = V x I

  3. Voltage (V) = Current (I) x Resistance (R) V = I x R

  4. Resistance (R) = Voltage (V) / Current (I) R = V / I

  5. Ohm's Law: Current (I) = Voltage (V) / Resistance (R) I = V / R

  6. Electrical Power (P) = Current (I)^2 x Resistance (R) P = I^2 x R or = V^2/R

  7. Electromotive Force (E) = Charge (Q) x Voltage (V) E = Q x V

  8. Charge (Q) = Current (I) x Time (t) Q = I x t

  9. Potential Difference (V) = Work done (W) / Charge (Q) V = W / Q

  10. Electrical Power (P) = Work done (W) / Time (t) P = W / t

  11. Resistance (R) = Resistivity (ρ) x Length (L) / Cross-sectional area (A) R = ρL / A

Note: In these formulae, the units used are SI units (i.e., joules, watts, volts, amperes, ohms, meters, and seconds).

Tip: You can write these down in a cheat sheet and bring it everywhere with you whenever you are doing your homework or revision!

If you are feeling lost, you can talk to us at 8749 8157!


bottom of page