"Voltage" Voltage Resistance PPT Teaching Courseware

"Voltage" Voltage Resistance PPT Teaching Courseware

Part One: Tutoring from Famous Teachers

1. Voltage is what causes current to form.

2. To obtain a continuous current in a circuit, two conditions must be met: (1) there is a power supply to provide voltage; (2) the circuit is a path.

Analysis of typical cases

[Example] Which of the following statements is correct ()

A． As long as there is voltage in a circuit, there will be current

B． As long as there is power in the circuit, there will be current

C. Voltage is necessary to produce current

D. As long as the circuit is a path, there will be current flowing through the conductors

[Analysis] The necessary conditions for a circuit to have continuous current: ① There is voltage at both ends of the circuit; ② The circuit is a path.

Error-prone warning

[Example] Regarding the electric meter as shown in the picture, which of the following statements is incorrect ()

A． it's a voltmeter

B． Its indication is 1.7V

C. Its indication may be 8.5V

D. It has one negative binding post and two positive binding posts

Voltage PPT, Part 2: Basic Training

Voltage

As shown in the picture is the nameplate of a mobile phone battery. The nominal voltage of the battery is _______V, which equals ______ mV; the maximum charging voltage of the battery is ______V.

Variation training

1. The function of power supply is to provide _______, and the function of voltage is to cause _______ to move directionally to form _______; in physics, the letter _______ represents voltage, and its unit is volt, represented by the letter _______.

2. Modern people's lives are inseparable from electricity. In order to use electricity safely, it is essential for us to understand some "electricity" common sense in life. Which of the following statements about common voltage values ​​is incorrect ( )

A． The voltage of a dry cell battery is 1.5V B. The voltage of household circuit is 220V

C. The cell phone battery voltage is 3.7V D. The safe voltage for human body is 36V

Voltage measurement

As shown in the figure, when the voltmeter uses two terminals "-" and "3", the maximum measurement value of the voltmeter is _______, and the minimum division value is _______. At this time, the indication of the voltmeter is _______; When the voltmeter uses two terminals "-" and "15", the maximum measurement value of the voltmeter is _______, and the minimum division value is _______. At this time, the indication of the voltmeter is _______.

Variation training

3. In the circuit shown in the figure, the switch S is closed and the correct circuit that can measure the voltage across L1 with a voltmeter is ()

4. As shown in the picture, Xiaohong is preparing to connect an electric meter to the circuit. She wants to measure ( ) in the circuit

A． Electric current B. Voltage

C. Resistor D. Electric energy

Voltage PPT, Part 3: Consolidation and Improvement

1. Regarding the relationship between power supply, voltage and current, which of the following statements is correct ( )

A． When there is voltage, there is power and current at the same time

B． When there is a power supply, there is voltage and current at the same time

C. When there is current, there is power and voltage at the same time

D. If there is power and voltage at the same time, there must be current

2. Regarding the rules for using voltmeters, which of the following statements is incorrect ( )

A． The voltmeter should be connected in parallel at both ends of the electrical appliance under test

B． The voltage across the circuit under test cannot exceed the maximum range of the voltmeter.

C. The current should flow in from the "+" terminal of the voltmeter and flow out from the "-" terminal.

D. You cannot use a voltmeter to directly measure the voltage of a dry cell battery

3. In the circuit below, when switch S is closed, the voltage across L2 can be measured with a voltmeter ( )

4. A voltmeter has two ranges, 3V and 15 V. The 3V range was used in the experiment. In one experiment, the scale lines on the dial with the 3V range were blurred, and the voltage read from the dial with the 15V range was just right. is 6.5V, then the actual measured voltage is ( )

A． 6. 5V　B. 2.5V

C. 1. 3V D. 1. 15V

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"Voltage" Voltage Resistance PPT courseware download:

"Voltage" Voltage Resistance PPT Courseware Download Part One: Tutorial Design Learning Point 1 Voltage Design the circuit shown in Figure 16-1-5 and complete the following experiments. Experiment 1: Observe the outer packaging of dry batteries to see if there is any content related to the knowledge in this section. Connect the circuit,...

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