Calculate the current flowing through a 10-ohm resistor connected to a 20-volt power supply using Ohm's Law.

The current flowing through the 10Ω resistor is 2 amperes (A).

Step-by-Step Solution:
Recall Ohm's Law: V = IR (where V=voltage, I=current, R=resistance)
Rearrange formula to find current: I = V/R
Insert values: I = 20V ÷ 10Ω
Calculate: I = 2A
Verify units match: volts/ohms = amperes ✓

Key Mistake to Avoid: Don't forget to convert all units to their standard form before calculation (e.g., if given milliamps or kilovolts).


Required practical element for all boards
Common calculation in 6-mark questions

Quick Tip: Create a triangle diagram with V at the top, I and R at the bottom - cover the quantity you need to find to see how to rearrange the formula.