"Voltage" Simple Circuit PPT Courseware 2

Description

"Voltage" Simple Circuit PPT Courseware 2

There are a large number of free electrons in metals, so they can conduct electricity. But why can electrons on metal conductors move in a direction?

Who is driving the directional movement of charges?

1. When there is no power supply in the circuit, these charges cannot move directionally and cannot form current.

2. When a power supply is connected to the circuit, the free electrons in the conductor move in a direction driven by the power supply, forming a current.

1. Voltage

To produce current in a circuit, there must be a voltage across it. The function of the power supply is to provide voltage to both ends of the electrical appliance.

illustrate:

1. Voltage is the cause of current in a circuit.

2. Power supply is a device that provides voltage.

2. Unit of voltage U:

1. The international unit is , abbreviated as , represented by the symbol .

2. Commonly used units include kilovolts (kV) and millivolts (mV).

3. Unit conversion:

1V=10³ mV

l kV=10³ V

Four common voltage values:

1. One dry battery: 1.5V

2. One battery: 2V

3. Household circuit: 220V

4. Safety voltage for human body: generally not higher than 36V

1. Correct use of voltmeter

1 The voltmeter must be connected in parallel with the electrical appliance under test.

2 The current must flow in from the “+” terminal and flow out from the “-” terminal.

3. The measured voltage should not exceed the range of the voltmeter.

Generally, the large range is selected for the test touch first. If the voltmeter's indication is within the small range, switch to the small range.

Note: The voltmeter can be directly connected to both ends of the power supply to measure the power supply voltage.

2. Voltmeter reading:

Measuring range used

Pay attention to the scale value

See where the pointer is pointing

write unit

think about it

What are the similarities and differences in the use of voltmeters and ammeters?

Voltmeter and ammeter (similar points)

1. Zero calibration is required before use.

2. When using, the current must flow in from the "+" terminal and out from the "-" terminal.

3. The measured current or voltage cannot exceed the range of the meter.

summary:

1. Understand the functions of voltage and power supply

2. Master the units and conversion relationships of voltage

3. Remember common voltage values

4. Master the use of voltmeter and the issues that should be paid attention to.

5. Able to accurately read the value of the voltmeter.

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Update Time: 2024-11-22

This template belongs to Physics courseware Beijing Normal University Ninth Grade Physics Volume 1 industry PPT template

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