![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
Physics and electricity in Junior Three
Series circuit: features: ① there is only one current path through each component. ② the whole circuit only needs one switch. ③ each component affects each other and cannot work independently. Current: the current in each part is equal, that is: I main circuit = I1 = I2 = I3 = =Parallel circuit: definition: the components are connected in parallel between two points of the circuit
Due to the aging of the insulator on the conductor, the conductor is directly connected, that is, short circuit. When the resistance of the conductor is 0.1 ohm, the current passing through the conductor is?
Second grade physics, help to do it, thank you
Voltage U = 220 V, so I = u / r = 220 / 0.1 = 2200A
RELATED INFORMATIONS
- 1. Connect wires on both sides of the resistance, and the resistance is short circuited. It can be seen that the resistance is in parallel with that wire. Because the resistance of the wire is small, the current is low So is the current basically distributed to the wire? In fact, will there be a little current through the short-circuit resistor?
- 2. In refitting the ammeter, wouldn't it be short circuited by connecting a resistor to the ammeter
- 3. How to judge which electric appliance or circuit is measured by Voltmeter and ammeter
- 4. An ammeter is equivalent to a wire. What is a voltmeter equivalent to?
- 5. In the circuit, what are the burnt out appliances, ammeters and voltmeters equivalent to? Are they wires or switches?
- 6. The resistance of an electric lamp is 10 ohm. The normal operation is that the voltage at both ends of the lamp should be 5 V, but the current power supply around us is 8 v How much resistance does it need to connect in series to make the lamp work normally?
- 7. When an unknown resistance is connected to the power supply in series with a 6 Ω resistance, its voltage at both ends is 4V; when it is connected to the same power supply in series with a 9 Ω resistance, its voltage at both ends is 3V
- 8. After a 3V, 15W small bulb is connected in series with a 2 ohm resistor, the small bulb lights up normally Seek 1: resistance R of small bulb 2: Voltage across resistor R2 3: If the small bulb is directly connected to the power supply, the small bulb will not be burnt out
- 9. As shown in the figure, the power supply voltage is 9V and remains unchanged, the range of the ammeter is 0 ~ 0.6A, and the resistance of the small bulb is 9 Ω, in order not to let the current in the circuit exceed the electric current What is the minimum value of sliding resistor in the circuit?
- 10. When 18V voltage is applied to a certain section of conductor, the current passing through it is 0.6A, then the resistance to the body is () ohm. If 9V voltage is applied to this section of conductor, the current passing through the conductor?
- 11. Electricity. It's very easy, that is, when there is a short circuit, does the voltmeter show the number and ammeter? Is it open circuit?
- 12. Short circuit / open circuit, is there current or voltage? When the circuit is short circuited, When the circuit is short circuited, When the circuit is open, When the circuit is open, Please give a specific answer So why is there current and no voltage when there is a short circuit? Is voltage not the cause of travel current? How can there be current without voltage?
- 13. There is a section of conductor. When the voltage at both ends is 2 V, the current passing through it is 0.5 A, and the resistance of this section of conductor is () A. if the applied voltage is zero, the current passing through it is () a, and the resistance of this section of conductor is () Ω
- 14. Give you a battery pack, two switches S1 and S2, two lights L1 and L2, and several wires. Design a circuit. Requirements: when S1 is closed only, L1 and L2 will light up; when S2 is closed only, L1 and L2 will not light up; when S1 and S2 are closed, L2 will not light up, L1 will light up, and it is bright
- 15. As shown in the figure, the circuit only needs to change the connection of one wire, so that the ammeter can measure the current passing through two bulbs at the same time, mark "×" on the wire to be connected, and then draw the wire to be connected
- 16. A copper wire and a nickel chromium alloy wire are of the same length and thickness. If they are connected in series in the circuit, which wire has the higher voltage at both ends? Which wire has the most current? Why?
- 17. In the series circuit, if one bulb is removed (there are multiple bulbs), will the total current change and the total voltage change?
- 18. Is there any relationship between the current and the cross-section of the wire? If the material is the same and the length is the same, only the cross-sectional area is different I = nesv
- 19. When two conductors with the same length and different cross-sectional area are connected in series, they compare the current and voltage. The thin one is ab, and the thick one is BC
- 20. How to use a wire and a battery to light a small bulb? It's a primary school version