"Scientific Exploration: Current in Series and Parallel Circuits" Understanding Circuits PPT Courseware 4

Description

"Scientific Exploration: Current in Series and Parallel Circuits" Understanding Circuits PPT Courseware 4

Water flowing through the turbine causes the turbine to rotate

Current passes through the filament, causing the light bulb to glow

What do the lights on and off in the two circuits mean?

1. The strength of the current

What do you think is the difference between the current running on an electric locomotive and a mobile phone?

1. Current (I): A physical quantity that represents the strength of the current.

2. Unit: Ampere, abbreviated as Ampere, symbol is A.

Common units of current:

Milliamp (mA) 1 mA=10-3 A

Microampere (mA) 1 mA=10-6 A

2. Measurement of current

1. Ammeter: An instrument for measuring current.

Get to know the ammeter

circuit symbol for ammeter

2. Connection of ammeter:

(1) The ammeter must be connected in series with the electrical appliance being measured.

(2) Current must flow in from the positive terminal and flow out from the negative terminal.

(3) The measuring range must be selected correctly.

(4) It is not allowed to connect the ammeter directly to the two poles of the power supply!

Use of ammeter

1. To measure the current in a certain part of the circuit, the ammeter must be connected in series to this part of the circuit.

How to connect an ammeter when measuring the current through a small light bulb

2. The current must flow into the ammeter from the "ten" terminal and out of the ammeter from the "one" terminal.

3. It is absolutely not allowed to connect the ammeter directly to the two poles of the power supply without using electrical appliances (short circuit), otherwise the ammeter will burn out quickly.

4. Large first and then small: try a large range first, such as the indication of an ammeter.

Within the small range, use the small range again. The measured current cannot exceed the range of the ammeter (test touch)

think about it

During the experiment, the following situations were found during the test, and the causes and solutions to the problems were analyzed.

1. Pointer reverse deflection:

Answer: It may be that the positive and negative terminals are connected reversely and should be reconnected.

2. The forward deflection of the pointer is too large:

Answer: This is because the range selection is too small and should be changed to a larger range.

practice

1. Which of the following household appliances passes the largest current during normal operation ( ).

A. TV set b. Ordinary fluorescent lamp

C. Household electric fan D. household electric iron

2. In the circuit shown in the figure, ammeter A1 measures ______ current, and A2 measures ______ current.

3. What is shown in the figure is the result of two measurements of the same circuit. Picture A uses the ______ measurement range, and the indication is ____A; Picture B uses the _______ measurement range, and the indication is ____A.

4. As shown in the figure is a physical connection diagram of a student using an ammeter to measure the current passing through a small light bulb. The three errors are:

⑴The power supply is short-circuited (the ammeter is directly connected to the two poles of the power supply)

⑵Ammeter and lamp are connected in parallel

⑶The positive and negative terminals of the ammeter are connected reversely

Keywords: Understanding Circuits Teaching Courseware, Scientific Inquiry: Current Teaching Courseware for Series and Parallel Circuits, Shanghai Science Edition Ninth Grade Physics PPT Courseware Download, Ninth Grade Physics Slide Courseware Download, Understanding Circuits PPT Courseware Download, Scientific Inquiry: Series Connection and current PPT courseware download of parallel circuits, in .PPT format;

For more information about the PPT courseware "Understanding Electric Circuits Scientific Exploration of Currents in Series and Parallel Circuits", please click the "Understanding Electrical Circuits Scientific Exploration of Currents in Series and Parallel Circuits" ppt tag.

"Scientific Exploration: Current in Series and Parallel Circuits" Understanding Circuits PPT Courseware 5:

"Scientific Exploration: Current in Series and Parallel Circuits" Understanding Circuits PPT Courseware 5 Do you still remember the experiment you did in the last class? The ammeter is connected at different locations in this simple circuit. What is the relationship between the two ammeter readings? When electrical appliances are connected in series or parallel, the flow flows through each...

"Scientific Exploration: Current in Series and Parallel Circuits" Understanding Circuits PPT Courseware 3:

"Scientific Exploration: Current in Series and Parallel Circuits" Understanding Circuits PPT Courseware 3 1. Assemble the circuit. Five points should be paid attention to when conducting experiments: ① The switch should _______ when connecting the circuit. ②The ammeter should be _______ in the circuit under test. ③Start from the positive pole (or negative pole) of the power supply..

"Scientific Exploration: Current in Series and Parallel Circuits" Understanding Circuits PPT Courseware 2:

"Scientific Exploration: Current in Series and Parallel Circuits" Understanding Circuits PPT Courseware 2 1. Current 1. Definition: In physics, the _______ (amount of charge) passing through any cross-section of a conductor per second is called _______ Make current. Represented by the letters _______. 2. Single..

File Info

Update Time: 2024-08-11

This template belongs to Physics courseware Shanghai Science Edition Ninth Grade Physics industry PPT template

Preview