How much current is taken by a bulb rated 100w,250V?

To calculate the current taken by a bulb rated at 100W and 250V, you can use the formula:

Power (W) = Voltage (V) x Current (A)

Rearranging the formula to solve for current:

Current (A) = Power (W) / Voltage (V)

Plugging in the values:

Current (A) = 100W / 250V
Current (A) = 0.4A

Therefore, the bulb rated at 100W and 250V will take 0.4 Amps of current.

Using Ohm's law, we can calculate the current taken by the bulb:

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

The resistance of the bulb can be calculated using the formula:

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

Substituting the given values into the formula:

R = 250V / 100W = 250Ω

Now, we can calculate the current taken by the bulb:

I = V / R = 250V / 250Ω = 1A

Therefore, the bulb takes 1 ampere of current.