How to calculate the cost of electricity consumption?

Question

Physics

Tell me how to calculate the cost of electricity consumption for a certain time (for example, 1 hour), knowing the average size of the power of the device (for example, 50W) and the cost of kW / h (5.5 rubles)

Answer 1

The cost of electricity consumption == the cost of kW / h * the power of the device * the operating time of the device.
Is it different on Mars?

Answer 2

everything will be clear if you write correctly
not kW / h, but kW * h
then 50W * 1 h \u003d 50Wh \u003d 0.05 kWh 0.05
kWh * 5.5 rubles / kWh \u003d rubles