What is the current that Flows in a circuit
When a 20 V battery is connected to the bulb
of resistance 90 ?

To find the current flowing through the circuit when a 20 V battery is connected to a bulb with a resistance of 90 ohms, we use Ohm’s Law, which states that Current (I) = Voltage (V) / Resistance ®. Plugging in the values, we get I = 20 V / 90 ohms, which equals approximately 0.222 A, or 222 mA. So it’s practically giving that bulb a nice little glow!

Now, consider this: If the resistance were to change—say, due to the bulb heating up—what would happen to the current? If the resistance increases, the current decreases, and vice versa. This is a nifty little dance of electricity and resistance, so being aware of how variables interact can help you understand how circuits behave under different conditions!