What is n in the definition of the true value of 1A current? The title of the book is electronic measurement and instrument (China Labor and social security Press), For example, the definition of 1A current is to produce a current of 2 times 10 to the negative seventh power per meter of length in two parallel straight wires with an interval of 1m. The current under this definition is the true value of 1A current. What does n mean? I hope you can give me your advice

What is n in the definition of the true value of 1A current? The title of the book is electronic measurement and instrument (China Labor and social security Press), For example, the definition of 1A current is to produce a current of 2 times 10 to the negative seventh power per meter of length in two parallel straight wires with an interval of 1m. The current under this definition is the true value of 1A current. What does n mean? I hope you can give me your advice

Your supplementary question: This is actually a question of understanding. That is to say, the current diversion is caused by the change of the positive and negative poles of the power supply. From the microscopic point of view, the electric field on the wire is rapidly reestablished at the speed of light in an instant. The key to the problem is that the electrons that generate the current in the wire are only a small part of the wire

In circuit calculation//
For example, RL / / RZ = 10 is how to calculate, known RZ = 10 RL did not tell

RL / / RZ means a simplified way to write these two resistors in parallel. It's not very standard, but it takes a long time for everyone to understand
The number you give is not appropriate. It can't be calculated
Revise:
RL / / RZ = 10 if RZ = 20
RL*rz/(RL+rz)=10
20RL/(20+RL)=10
20RL=200+10RL
10RL=200
RL=20Ω

How much current is 1 kW? How much kW is 1A?

P = UI, power equals voltage x current. If you don't say power or voltage, you can only calculate it yourself. I = P / u