"Voltage" Voltage Resistance PPT Courseware 4

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"Voltage" Voltage Resistance PPT Courseware 4

Voltage

Conditions for the formation of water flow:

1. Water

2. Water height difference (water pressure)

Conditions for the formation of current:

1. Free charge

2. Electrical height difference (voltage)

1. Water flow:

The role of water pressure and the height difference between water (water level difference, water pressure difference): the cause of water flow.

2. Current:

Free charge (positive charge, negative charge)

Electrical height difference (potential difference, voltage difference)

The role of voltage: the cause of current flow.

For there to be current in a circuit, there must be voltage across it

Voltage

Voltage is represented by the letter U SI unit: volt (V)

Commonly used units include:

1 kilovolt (kV) = 1000 volts (V)

1 volt (V) = 1000 millivolts (mV)

1 millivolt (mV) = 1000 microvolts (μV)

The voltage value around you

Several common voltage values:

One dry cell: 1.5V n×1.5V

One battery: 2V n×2V

Household circuit: 220V

Safety voltage: no higher than 36V

Power voltage: 380V

Four things to note when using a voltmeter correctly

1 The voltmeter should be connected in parallel in the circuit

2 The voltmeter has positive and negative terminals

3 The voltmeter has two ranges (0-3V 0-15V)

4 The voltmeter can be directly connected to the power supply

think about it

Correctly use the ammeter and voltmeter to correspond to the four points.

1 connected in series in a circuit connected in parallel in a circuit

2 There are positive and negative terminals. There are positive and negative terminals.

3 There are two measuring ranges There are two measuring ranges

4 Cannot be directly connected to the power supply Can be directly connected to the power supply

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For more information about the "Voltage Voltage Resistance" PPT courseware, please click the Voltage ppt Voltage Resistance ppt tag.

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Update Time: 2024-11-22

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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