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Can some help me understand how to calculate one electrical energy?

Various devices in a house contribute to the total energy consumption. If a toaster (R = 18.0 ohms), an air conditioner (R = 24.0 ohms), and an electric lamp (R = 192 ohms) are connected in all 120.0V sockets, which is the power consumption of each device? What is the total power use?

The power supply is watts or volt ampere volt-ampere is just that Volt X Amps Amps must order Ohms Law is amps = voltage (120 volts are used) by resistance (or ohms) I = E / R So in this case for the first unit with 18 ohms at 120 volts the amps (I) is divided to 120 divided by 18 which gives 6.66 amps. The power of this device using VA or wattage is time consuming, it is then 6.66 x 120 volts or 799 VA (Volt times ampere) The AC has 24 ohms, so that is 120 amps at 24 or 5 amps, you divided the lamp 600 Va. at 192 ohms BS at first, because if it is 192 ohms, it was not even on to come. (You can not press more resistance than the voltage of the current, almost physically impossible and for this reason) 120 divided by 194 gives 0.61 amps gives you a near-zero power factor, but for your purposes, we go with him and say, 0.61 X 120 gives 7.32 VA. So total power use is 7.32 and 799 VA and 600 VA VA, the "use of force." They use a total capacity of 1406.32 VA or Find the Amps with OHMS Law then find the power usage by multiplying the voltage the source times the amperage of the appliance, motor, appliance, what you have. Hope it helps.