"Measuring Voltage" Understanding Circuits PPT Courseware 5

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"Measuring Voltage" Understanding Circuits PPT Courseware 5

A colored light bulb requires a voltage of 22V when it glows normally. If they are connected to a 220V household circuit, how should they be connected to make the circuit work safely?

In a series circuit, what is the relationship between the total voltage across the circuit and the voltage across each part of the circuit?

In a parallel circuit, what is the relationship between the total voltage across the circuit and the voltage across each branch?

1. The rules of voltage in series circuits

(1) Ask questions

What is the relationship between the voltage of each part of the circuit in a series circuit and the total voltage?

(2) Conjectures and assumptions (imitating water pressure)

3. Design experiments:

friendly reminder:

1. What equipment is needed for the experiment?

2. What physical quantities should be measured during the experiment?

3. Draw the corresponding circuit diagram.

4. How to divide labor during experiments?

4. Conduct experiments

friendly reminder:

1. When assembling a circuit, first place the components according to the circuit diagram and then connect them.

2. When connecting the circuit, the switch should be turned off.

3. Before closing the switch, recheck whether the circuit is correct.

4. Record experimental data and any problems discovered during the experiment in a timely manner.

2. Rules of voltage in parallel circuits

(1) Ask questions

What is the relationship between the total voltage across a parallel circuit and the voltage across each branch?

(2) Conjecture or hypothesis (imitating water pressure)

(3) Design experiment - circuit diagram

practice

1. As shown in the figure below, the power supply consists of three new dry batteries connected in series. After the switch is closed, it is known that the indication of _____ is 1.5V, then the indication of _____ is _____V, and the indication of _____ is _____V .

2. In the circuit as shown in the figure, if the indication of _____ is 2.8V after the switch is closed, then the voltage across L2 is __________V,

3. As shown in the figure, lights L1 and L2 are ___ connected.

The voltmeter measures the voltage across the lamp ___.

If the power supply voltage is 8V and the voltmeter indicates 3V, then the voltage across the lamp L1 is ___V and the voltage across the lamp L2 is ___V.

4. During the experiment, Xiao Ming accidentally connected the light bulb and the voltmeter in series in the circuit. What happened when he closed the switch?

When the switch is closed: the small bulb does not light up and the voltmeter has an indication, which is approximately the power supply voltage.

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Update Time: 2024-11-19

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