There is a 220 V, 1100 w electric furnace, connected to the 220 V circuit, how much power consumption per hour? What is the current intensity through the electric furnace 1. There is a "220 V, 1100 W" electric furnace, which is connected to the 220 V circuit. What is the power consumption per hour? What is the current intensity through the electric furnace? What is the resistance of the electric furnace? How many joules does the current work per second? 2. How many "220 V, 25 W" lamps can a 3A watt hour meter install at most? How many hours can one "220 V, 25 W" lamp work normally for one kilowatt hour?

There is a 220 V, 1100 w electric furnace, connected to the 220 V circuit, how much power consumption per hour? What is the current intensity through the electric furnace 1. There is a "220 V, 1100 W" electric furnace, which is connected to the 220 V circuit. What is the power consumption per hour? What is the current intensity through the electric furnace? What is the resistance of the electric furnace? How many joules does the current work per second? 2. How many "220 V, 25 W" lamps can a 3A watt hour meter install at most? How many hours can one "220 V, 25 W" lamp work normally for one kilowatt hour?

1. The furnace works normally, so: w = Pt = 1.1KW * 1H (1.1kw × 1H) = 1.1kwh = 1.1 degree
I=P/U=1100W/220V=5A
R = u / I = 220 V / 5A = 44 Ω
One second current work W '= Pt' = 1100W * 1s = 1100j
2. The maximum power capacity of electric energy meter is: Pmax = UI = 220V * 3A = 660w
Therefore, the maximum number of lamps that can be installed = Pmax / P = 660w / 25W = 26
1 kilowatt hour (Note: 1 kilowatt hour = 1kwh) can provide 25W lamp normal working time: because P = 25W = 0.025kw
From t = w / P = 1kwh / 0.025kw = 40H, it can work for 40 hours

How many microwatts per square centimeter is one watt per square meter

=10^6uW/10^4cm²
=10^2uW/cm²
=100uW/cm²