There is a "220 V 500 W" electric furnace, connected to the 220 V circuit, 0.4 hours to consume --- degree of electricity, the current through the circuit wire is --- A, the current in 1 s to do --- work

There is a "220 V 500 W" electric furnace, connected to the 220 V circuit, 0.4 hours to consume --- degree of electricity, the current through the circuit wire is --- A, the current in 1 s to do --- work

Power consumption degree = 0.5KW * 0.4h = 0.2KW * H = 0.2 degree
I=P/U=500W/220V≈2.27A
The amount of work done in one second is equivalent to power equal to 500

What is the total current drawn from the power supply when two electric lamps of 220 V 40 W and 220 V 25 W are connected to 220 V power supply
Calculation questions
It is better to have a relatively simple calculation formula

Shao ice:
"Because of parallel connection, it can be calculated directly
I=P/U
I=40W+25W/220V=0.295A "
Should be:
I=P/U
I=(40+25)/220
=65/220
=0.295(A)

A 220 V, 30 W incandescent lamp, connected to 220 V power supply, try to find out the current through the lamp and the resistance when the lamp works under 220 V voltage

I=P/U=30w/220v≈0.136A
R=U^2/P=220v^2/30w≈1613Ω