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"Let the Lamp Shine" Understanding Circuit PPT Courseware
1. Composition of the circuit
1. Circuit: A current path formed by connecting _______, _______, and _______ using _______.
2. The role of each component in the circuit
(1) Power supply: A device that provides _______ in the circuit. When the power supply works, it converts _______ into electrical energy.
(2) Electrical appliances: Electrical appliances are devices that use electric current to work. When they work, electrical appliances convert energy into _______ energy. Common electrical appliances include lights, _______, _______, _______, etc.
(3) Switch: _______ used to control the circuit. Common switches include pull-wire switches, blade switches, air switches, etc.
(4) Wires: used to _______ to transmit electrical energy.
3. Direction of current
(1) The _______ of electric charges forms an electric current. Physics stipulates that the direction of ______________ is the direction of current.
(2) The direction of current in the circuit: from_______→electrical appliance→_______.
2. The status of the three circuits
1.Passage: _______ circuit. The characteristic is that there is current in the circuit and the electrical appliances can work.
2. Open circuit: _______ circuit. The characteristic is that there is no current in the circuit and electrical appliances cannot work.
3. Short circuit: A circuit in which the two poles of the power supply are directly connected without passing through _______. When there is a short circuit, the current in the circuit is very large, which will burn out the power supply and wires. Care should be taken to avoid short circuits!
3. Circuit diagram
1. Circuit diagram: A diagram showing the circuit connections using _______.
2. When drawing a circuit diagram, please pay attention to: ① It must be _________; ② It must be _________.
1. Circuit composition and three states
(1) The most basic composition: It consists of power supply, switch, electrical appliances, and wires. Without any part, the circuit is not complete.
(2) Three states of circuits: ①Path: A circuit that is connected everywhere. The characteristic is that there is current in the circuit and the electrical appliances can work. ②Open circuit: A circuit that is disconnected somewhere is called an open circuit. The characteristic is that there is no current in the circuit and electrical appliances cannot work. ③Short circuit: A circuit that directly connects the positive and negative poles of the power supply with wires without passing through the electrical appliance. When there is a short circuit, the current in the circuit is very large, which will burn out the power supply and wires. Therefore, care should be taken to avoid short circuits!
2. Things to note when drawing circuit diagrams
(1) Use uniformly specified circuit component symbols.
(2) The wires should be connected horizontally and vertically to avoid crossing; the circuit components should be placed appropriately and generally cannot be drawn at the corners of the circuit diagram; to ensure that the circuit diagram is simple, neat and beautiful.
(3) Do not connect them to open circuit or short circuit.
Knowledge point 1: The composition of the circuit
1. Which statement about the circuit is wrong ()
A. A power supply is a device that provides electrical energy
B. Only when the circuit is closed, there is current in the circuit
C. Current flows in the direction of "positive electrode → electrical appliance → negative electrode"
D. Electrical appliances are devices that convert other forms of energy into electrical energy.
2. As shown in the picture is the room card of a hotel. Only by inserting the key card into the slot can the lights and sockets in the room have power. The function of the room card is equivalent to a _______ (circuit filling component) connected to the main road.
3. The circuit as shown in the picture is in the _______ state at this time; when the switch is closed, the small bulb emits light, and the circuit is in the _______ state at this time; if a and b are connected with a wire after the switch is closed, the circuit is at this time In a state of_______.
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