An electric lamp has the following markings 230V. 250W, How long would it take the lamp to use one

kilowatt-hour when connected to a 230V mains?

250 W = .25 kw

so 4 hours

Woww. Thanks

To determine how long it would take for the lamp to use one kilowatt-hour (kWh), we need to find the power consumption of the lamp and then calculate the time it takes to consume one kWh.

First, let's look at the markings on the lamp:
- Voltage: 230V
- Power: 250W

The power (P) of the lamp is given as 250W. This means that when the lamp is connected to a 230V mains, it consumes 250 watts of power.

Now, to calculate the time it takes for the lamp to consume one kWh, we need to convert the power to kilowatts (kW) and use the formula:

Time (t) = Energy (E) / Power (P)

Given:
Energy (E) = 1 kWh = 1000 Wh
Power (P) = 250W

To convert the power from watts to kilowatts, we divide by 1000:
Power (P) = 250W / 1000 = 0.25 kW

Now we can calculate the time (t):
Time (t) = Energy (E) / Power (P)
Time (t) = 1000 Wh / 0.25 kW

Since 1 kilowatt-hour (kWh) is equal to 1000 watt-hours (Wh), we can substitute this value in the equation:
Time (t) = 1000 Wh / 0.25 kW = 4000 hours

Therefore, it would take the lamp approximately 4000 hours to consume one kilowatt-hour (kWh) when connected to a 230V mains.