FreeNotes
Statements: 1. A 12V potential difference is applied across a copper conductor with a resistance of 6 kilo-ohm. Find: The current passing through it. The charge passing through any cross-sectional area in one hour. 2. During lightning, a current of 15,000A is established when 40C charge passes through a tree due to a potential difference … Read more
To show that Volt-Ampere (VA) is equal to Watt (W), let’s analyze the units step by step. Step 1: Define Power Electrical power (P) is given by: P=V×I where: V is the voltage in volts (V), I is the current in amperes (A). Step 2: Express SI Units The SI unit of voltage (V) is: 1 … Read more
The resistance of a filament is given by Ohm’s law: R=V2/P where: V=220V (same for both bulbs), P is the power rating. Step 1: Calculate the Resistance of Each Bulb For the 100 W bulb: R1=2202/100=48400/100=484 Ω For the 200 W bulb: R2=2202/200=48400/200=242 Ω Step 2: Relationship Between Resistance and Thickness The resistance of a wire is … Read more