Two resistors of 6 and 3 ohm respectively are connected in series at both ends of the 9 V power supply. After the switch is closed, the current in the circuit is? Why divide by 6 + 3

Two resistors of 6 and 3 ohm respectively are connected in series at both ends of the 9 V power supply. After the switch is closed, the current in the circuit is? Why divide by 6 + 3

1a, voltage divided by resistance 9 / 6 + 3 series circuit resistance value is added

The resistance of a electric furnace is twice that of B. if they are connected to the circuit with the same voltage, the one that releases less heat in the same time is a, B, B, C

p=u^2/r
Therefore, the voltage is the same, when the resistance is small, the power is good, and the calorific value is more
Therefore, the calorific value of B is large, and B is chosen

What is the energy conversion between ampere force and overcoming ampere force?

When ampere force does work, electrical energy is converted into mechanical energy. When ampere force is overcome, mechanical energy is converted into electrical energy

If machine a does 1000 joules of work and machine B does 500 joules of work, and the time taken by machine a is three times that of machine B, the ratio of their power is ()
A. 6：1B. 1：6C. 2：3D. 3：2

It can be seen from the question that w a: W B = 1000j: 500J = 2:1, t a: t b = 3:1, p a = w a t a, P B = W B T B, so p a: P B = w a t a: W B T B = 23:11 = 23:1 = 2:3