1. Resistance
Rate - also known as resistance coefficient or specific resistance. It is a physical quantity used to measure the electrical conductivity of a substance, expressed in letters ρ Represented in ohms * millimeters square per meter. In terms of numerical value, it is equal to the resistance value of a wire with a length of 1 meter and a cross-sectional area of 1 square millimeter made of that substance at a temperature of 20C. The higher the resistivity, the lower the conductivity. The physical quantity in which the resistivity of a substance changes with temperature, and its value is equal to the ratio of the increase in resistivity to the original resistivity for every 1C increase in temperature, usually expressed in letters α Represented in 1/C.

2. The temperature coefficient of resistance - represents the electricity of a substance
The physical quantity of resistance that changes with temperature, whose value is equal to the ratio of the increase in resistivity to the original resistivity for every 1C increase in temperature, usually written in letters α Represented in 1/C.

3. Conductivity - The ability of an object to conduct current is called conductivity. In a DC circuit, the value of conductivity is the reciprocal of the resistance value, expressed in letters ɡ Represented in ohms.

4. Conductivity, also known as conductivity coefficient, is a physical quantity that measures the conductivity of a substance. Size is the reciprocal of electrical resistivity in numerical terms, expressed in letters γ Represented in meters/ohms * millimeters square.

5. Electromotive force - the potential difference caused by the conversion of other forms of energy into electrical energy in a circuit, called electromotive force or simply electromotive force. Represented by the letter E, in volts.

6. Self induction - When the current in a closed circuit changes, the magnetic flux generated by this current passing through the circuit itself also changes, thus inducing an electromotive force in the circuit. This phenomenon is called self induction, and this induced electromotive force is called self induction electromotive force.

7. Mutual inductance - If two coils are close to each other, a portion of the magnetic flux generated by the current in * * coils is linked to * * coils. When the current in the * * coil changes, its magnetic flux with the * * coil loop also changes, generating induced electromotive force in the * * coils. This phenomenon is called mutual inductance.