The simplest circuit consists of four parts, which are the power supply of (), the wire that converts electric energy into other forms of energy (), () and the control circuit The simplest circuit consists of four parts: the power supply of (), the wire that converts electric energy into other forms of energy (), and the wire that controls the circuit on and off

The simplest circuit consists of four parts, which are the power supply of (), the wire that converts electric energy into other forms of energy (), () and the control circuit The simplest circuit consists of four parts: the power supply of (), the wire that converts electric energy into other forms of energy (), and the wire that controls the circuit on and off

Provide electrical energy with electrical appliances transmission switch

The following statement is correct ()
A. As long as there is power in the circuit, there must be current. B. as long as there is power in the circuit, there must be voltage at both ends of the appliance. C. as long as there is voltage at both ends of the conductor, there will be current in the conductor. D. as long as there is free charge in the conductor, there must be current

A. If there is a power supply in the circuit and the circuit is closed, there will be current in the circuit, there will be voltage in the circuit, there will not be current in the circuit, so a is wrong; B, if there is a power supply in the circuit, when the two ends of the appliance are connected with the two poles of the power supply, there will be voltage at both ends of the appliance, so B is wrong; C, as long as there is voltage at both ends of the conductor, there will be instantaneous current in the conductor, not necessarily continuous current, so C is correct D. the directional movement of charge forms a current. If there is a free charge, the directional movement does not necessarily occur, so there is no current, so D is wrong

From which pole does the external current flow to which pole?
Our monthly exam questions
They all say it's positive to negative, but I think it's negative to positive!

Inside the power supply is negative to positive, outside the power supply is positive to negative
Electrons and current flow in the opposite direction. Don't confuse them
If you've been to compulsory 3 in high school, you'll understand

In a circuit, a power supply is a device that provides electric energy, right? The conductor is easy to conduct electricity because there are a lot of free electrons in the conductor, right

In reality, the power supply generally refers to the device that provides electric energy, but in the circuit analysis, it is not completely the device that provides electric energy. In many cases in the circuit, the equivalent transformation of the circuit is needed. Therefore, some components also need to be analyzed after the equivalent transformation