It is known that the voltage applied at both ends of the toy motor driving the small electric fan is 1.5V, and the current passing through the motor is 0.5A. If 60% of the electric energy consumed is converted into blades How much mechanical energy can be obtained when the wheel is turned on for one minute?

It is known that the voltage applied at both ends of the toy motor driving the small electric fan is 1.5V, and the current passing through the motor is 0.5A. If 60% of the electric energy consumed is converted into blades How much mechanical energy can be obtained when the wheel is turned on for one minute?

1.5vx0.5ax0.6x60s = 27ws = 27j (joule)

In parallel circuit, what is the relationship between the electric power of two resistors

If the voltage is equal in parallel, then:
U1=U2
According to Ohm's law, I = u / R, then
I1R1=I2R2
Therefore, I1: I2 = R2: R1
P1=U1I1
P2=U2I2
Then: P1: P2 = u1i1: u2i2 = R2: R1
That is, in parallel circuit, the electric power of two resistors is inversely proportional to the resistance value of the two resistors

1. When the resistance of one branch increases, how will the total resistance change?
2. If an arbitrary resistor is connected in parallel, the total resistance of the parallel circuit will decrease?

1. No matter in series or in parallel, if any resistance increases, the total resistance will increase!
2. No matter how large or small the parallel resistance is, adding one more parallel phase will reduce the total resistance a little bit. More common, it's like a ditch. If there is one more ditch, no matter how small the ditch is, the total water passing through will increase
This can be easily seen from the calculation formula of series parallel resistance