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None if it's unplugged. It may be using a small amount if it is left plugged in. When the hair dryer is not being used it uses no electricity.
15 min = ¼ h Energy = (1.200 kW) * (¼ h) = 0.3 kWh
None if your plugged in to the neighbors electricity!!
When you get your electric bill, look to see how many kilo watt hours (kWh) you used for the month. Then how much the bill cost. take the price divided by the (kWh). This is truly what your paying per (kWh). One (kWh) is 1000 watts being used for a hour, so one 100 watt light being used for 10 hours = 1 (kWh) or a 1500 watt hair dryer being used for an hour = 1.5 (kWh). so if your appliance power use is listed in amps, take amps x volts to figure out the watts. Plus determine how often the appliance runs. this will give You an idea of cost.
Total Energy used=1.6x(20/60)x6*0.12=0.38p
1 mwh = 1000 kwh hence 4 mwh = 4000 kwh
it takes up 3500 kWh
1 kwh = 3,600,000 Joules
100 kWh
about 10,000 KWh
approximately 40 kWh
1 PJ equals 277 777 777.78 kWh