A and B dual-purpose electrical appliances, the electric power ratio is 1 / 4, the resistance value ratio is 1 / 9, then the current value ratio through them is ()

A and B dual-purpose electrical appliances, the electric power ratio is 1 / 4, the resistance value ratio is 1 / 9, then the current value ratio through them is ()

I = P / R under root I a = root 1 / 1 I B = root 4 / 9 I a ratio I B = 1:2 / 3 = 3:2

When a 6-resistor consumer is connected to a 6V power supply for 5min, we can calculate: 1. The work done by the current passing through the consumer; 2. The electric power of the consumer

Known: r = 6 ohm, u = 6V, t = 5min = 300s
Seek: W, P
1、 I=U/R=6/6=1（A)
P=UI=6W
W=Pt=1800(J)
2、 W=UIt
P = square of U2 / R voltage
Note: the first solution is available in formula books, and the second solution may not be available due to different versions of books, such as the textbook of pep!