MindMap Gallery Junior high school physics and electricity
This is a mind map about electricity in junior high school, including current, Voltage, resistance, Electric power, electrical energy, Electromagnetic induction, etc.
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Junior high school electricity.
current
Definition of current
Electric current is the directional movement of charge
direction of current
The direction of movement of positive charges is the direction of current flow
Negative charges move in the opposite direction to the current
Measurement of current
Use of ammeter
Structure of ammeter
The structure of the ammeter includes range, pointer, dial, etc.
The structure of the ammeter also includes two terminals, one terminal is connected to the positive terminal and the other terminal is connected to the negative terminal.
ammeter reading
The reading of the ammeter needs to be determined based on the position of the pointer and the scale on the dial
The reading of the ammeter also needs to pay attention to the range of the ammeter and cannot exceed the range.
Voltage
Definition of voltage
Voltage is the potential difference between two points in an electric field
direction of voltage
The direction of voltage is from high potential to low potential
Voltage measurement
Use of voltmeter
Structure of voltmeter
The structure of a voltmeter includes range, pointer, dial, etc.
The structure of the voltmeter also includes two terminals, one terminal is connected to the positive terminal and the other terminal is connected to the negative terminal.
voltmeter reading
The reading of the voltmeter needs to be determined based on the position of the pointer and the scale on the dial
The reading of the voltmeter also needs to pay attention to the range of the voltmeter and cannot exceed the range.
resistance
Definition of resistance
Resistance is the resistance of a conductor to the flow of electricity
The size of the resistance is related to the material, length, cross-sectional area and temperature of the conductor
Measurement of resistance
Use of resistance meter
Structure of resistance meter
The structure of the resistance meter includes range, pointer, dial, etc.;
The structure of the resistance meter also includes two terminals, one terminal is connected to the positive electrode, and the other terminal is connected to the negative electrode.
Resistance meter reading
The reading of the resistance meter needs to be determined based on the position of the pointer and the scale on the dial;
The reading of the resistance meter also needs to pay attention to the range of the resistance meter and cannot exceed the range.
Electric power
Definition of electrical power
Electrical power is the work done by current per unit time
The magnitude of electrical power is related to current, voltage and resistance
Measurement of electrical power
Use of electric power meter
The structure of electric power meter
The structure of the electric power meter includes range, pointer, dial, etc.
The structure of the electric power meter also includes two terminals, one terminal is connected to the positive pole, and the other terminal is connected to the negative pole.
Electrical power meter reading
The reading of the electric power meter needs to be determined based on the position of the pointer and the scale on the dial.
The reading of the electric power meter also needs to pay attention to the range of the electric power meter and cannot exceed the range.
Electric energy
Definition of electrical energy;
Electrical energy is the ability of charges in an electric field to do work
The amount of electrical energy is related to current, voltage and resistance
Measurement of electrical energy
Use of electric energy meter
Structure of electric energy meter
The structure of the electric energy meter includes range, pointer, dial, etc.
The structure of the electric energy meter also includes two terminals, one terminal is connected to the positive pole, and the other terminal is connected to the negative pole.
Energy meter reading
The reading of the electric energy meter needs to be determined based on the position of the pointer and the scale on the dial
The reading of the electric energy meter also needs to pay attention to the measuring range of the electric energy meter. It cannot exceed the measuring range.
Electromagnetic induction
Definition of electromagnetic induction
Electromagnetic induction is the effect of a force on an electric current in a magnetic field
The magnitude of electromagnetic induction is related to current, magnetic field and resistance
Measurement of electromagnetic induction
Use of electromagnetic induction meter
The structure of electromagnetic induction meter
The structure of the electromagnetic induction meter includes range, pointer, dial, etc.
The structure of the electromagnetic induction meter also includes two terminals, one terminal is connected to the positive pole, and the other terminal is connected to the negative pole.
Readings from the electromagnetic induction meter
The reading of the electromagnetic induction meter needs to be determined based on the position of the pointer and the scale on the dial.
The reading of the electromagnetic induction meter also needs to pay attention to the range of the electromagnetic induction meter, which cannot exceed the range.
electrical experiments;
The purpose of electrical experiments
The purpose of electrical experiments is to verify electrical theories and improve experimental skills
Steps in electrical experiments
The steps of electrical experiments include experimental preparation, experimental operation, experimental recording and experimental analysis
Precautions for electrical experiments
Precautions for electrical experiments include safe operation, correct use of instruments and compliance with experimental rules;]