You can see the + and – symbols on the shell of the NOORI dry battery. + means the positive pole and – means the negative pole. You can see the detailed battery model and the words “Voltage 1.5V” on the battery.<\/p>\n
The shell of the NOORI dry battery is a cylinder made of zinc, which contains the electrolyte. There is also a carbon rod in the zinc cylinder.<\/p>\n
The chemical reaction between the electrolyte and the zinc skin in the dry battery causes a lot of positive charges to accumulate on the carbon rods, and a lot of negative charges to accumulate on the surface of the zinc cylinder. The carbon rod and zinc cylinder are called the electrodes of the dry battery. The carbon rod that collects positive charges is the positive electrode, and the zinc cylinder that collects negative charges is the negative electrode. The symbols + and – on the dry cell casing represent the positive and negative poles of the battery respectively. “Voltage 1.5V” means that the voltage between the two poles of the battery is 1.5 volts.<\/p>\n
What is voltage? You can use the metaphor of water flow to illustrate.<\/p>\n
If the switch is turned on, a flow of water will form in the water pipe from the water tower to the user. This is because the water level of the water tower is higher than that of the users, which creates water pressure in the water pipes connecting the two. The function of the water pump is to continuously pump water from a low place to a high point in the water tower, so that the water level at the water tower is always higher than at the user’s location, maintaining a certain pressure between the two, so that the water continues to flow.<\/p>\n
When a small light bulb is connected between the two poles of the battery with a wire, the small light bulb lights up, indicating that there is current in the circuit. The free charge in the circuit can move directionally to form a current because the positive pole of the power supply has excess positive charge and the negative pole of the power supply has excess negative charge, thus generating a voltage on the circuit. The function of the power supply is similar to that of a water pump. It continuously accumulates positive charges on the positive pole and negative charges on the negative pole, maintaining a certain voltage between the two poles and allowing current to continuously flow through the circuit.<\/p>","protected":false},"excerpt":{"rendered":"
You can see the + and – symbols on the shell of the NOORI dry battery. + means the positive pole and – means the negative pole. You can see the detailed battery model and the words “Voltage 1.5V” on the battery. The shell of the NOORI dry battery is a cylinder made of zinc, …<\/p>\n