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As shown in the figure, given the resistance R1 = 3 Ω, R2 = 6 Ω, the indication of ammeter A is 0.6A, then the indication of ammeter A1 is 0.6A______ .
According to the circuit diagram, two resistors are connected in parallel, ammeter a measures the current of main circuit, and ammeter A1 measures the current of R1 branch. Because the voltage at both ends of each branch in the parallel circuit is equal, the current ratio of the two branches: i1i2 = ur1ur2 = r2r1 = 6 Ω 3 Ω = 21, that is, I2 = i12. Because the current of main circuit in the parallel circuit is equal to the sum of the currents of each branch, I = I1 + I2 = I1 + i12 = 3i12 = 0.6A, then I1 = 0.4A 4 a
In the circuit diagram, resistor R1 and R2 are connected to the 6V power supply in parallel. If the switch is closed, the indication of ammeter A1 and a are 0.1A and 0.3A respectively?
(1) Resistance R1 = ui1 = 6v0.1a = 60 Ω; answer: resistance R1 is 60 Ω. (2) current through resistance R2 I2 = i-i1 = 0.2A; answer: current through resistance R2 is 0.2A. (3) heating power of resistance R1 P1 = ui1 = 6V × 0.1A = 0.6W; answer: heating power of resistance R1 is 0.6W
As shown in the figure, given the resistance R1 = 3 Ω, R2 = 6 Ω, the indication of ammeter A is 0.6A, then the indication of ammeter A1 is 0.6A______ .
According to the circuit diagram, two resistors are connected in parallel. Ammeter a measures the current of main circuit and ammeter A1 measures the current of R1 branch. Because the voltage at both ends of each branch in the parallel circuit is equal, the ratio of the current of the two branches: i1i2 = ur1ur2, R1 = 6 Ω 3 Ω = 21, i.e. I2 = i12, because the current of main circuit in the parallel circuit is equal to the current of each branch
What are the meanings of joules
1. In w = FS, the unit of work done by W for power is J. is this j the combination of those two units? Nm? Or Newton kilometer? Or what?
2. In w = Pt, W is work. The unit is J. is this j the combination of those two units? Watt seconds? Or kilowatt hours?
3. In q = cm △ T, q is the heat absorbed or released. The unit is J. is this j the combination of those two units?
4. In w = uit, W is electrical work, and the unit is J. what about the combination of these two units?
1. Niu mi
2. Watt second
3. KGM / kcal or J / CAL
4. AVS = joules
How to calculate the power and current in a circuit of electricity?
Suppose there are three circuits a, B and C. There are 8 36 watt lamps L in circuit a, 10 48 watt lamps m in circuit B and 12 60 watt lamps n in circuit C. how to calculate the power and current of their respective circuits? System diagram?
If you just want to know the effective power of phases a, B and C, it's very simple. Take phase a as an example, 8 * 36W = 288w. As for the current, you can't calculate it because you don't say how many volts it is. And even if you give the voltage, the effective current = effective power / voltage
In the formula P = u2r for calculating electric power, u is the voltage value applied at both ends of the consumer, and R is the resistance value of the consumer, then this formula can be used for ()
A. Calculate the power of refrigerator B. calculate the power of electric fan C. calculate the power of electric iron D. calculate the power of all electrical appliances
A refrigerator is not a pure resistance circuit, so this formula can not be applied. So a error & nbsp; & nbsp; B electric fan is not a pure resistance circuit, so this formula can not be applied. So B error & nbsp; & nbsp; C electric iron is a pure resistance circuit, so this formula can be applied, so C is correct & nbsp; d this formula is only applicable to pure resistance circuit, and does not calculate the power of all electrical appliances
How many ohms is a kiloohm
The resistance of a conductor to current is called resistance. The symbol is r
The unit of resistance is Ohm, short for ohm, and the symbol is Ω. The unit larger than ohm is kiloohm (K Ω) megaohm (m Ω)
1MW=1000KW
1KW=1000W
How many joules is one degree
1 degree = 1 kWh
=1000 * 3600 joules
=3600000 joules
=3.6 * 10 ^ 6 joules
How to calculate the total power in the circuit?
Is P1 + P2 = P total in parallel?
Is P1 + P2 = P total in series?
Yes
In parallel, P1 + P2 = P total
In series is P1 + P2 = P total
All P = P1 + P2
Using P = UI
P=W/T
P = I (square) r
P = u (square) / R
The voltage and rated power of electrical appliances at rated voltage
Rated voltage the voltage at which the appliance operates
Rated power the electrical power of an electrical appliance at voltage
Rated voltage. The voltage of electrical appliances in normal operation
Rated power. Electrical power of electrical appliances at rated voltage
RELATED INFORMATIONS
- 1. A circuit composed of a resistor, a power supply and an ammeter in series, The indication of the ammeter is 0.12A; if a 10 ohm resistor is connected in series in this circuit, the indication of the ammeter is 0.1A. Calculate the voltage of the power supply and the resistance in the original circuit
- 2. In the circuit shown in the figure, the power supply voltage remains unchanged, R1 = 10 Ω. When the switch S is closed and the slide P of the sliding rheostat is in the middle point, the indication of the ammeter is 0.3A; when the slide P is moved to the rightmost end, the indication of the ammeter is 0.2A. Then the power supply voltage is 0.3A______ 5. The maximum resistance of sliding rheostat is______ Ω．
- 3. If the internal resistance Ra of the ammeter is 0.03 ohm and the internal resistance RV of the voltmeter is 2 kiloohm, the resistance R to be measured is about 1.5 kiloohm, and the internal and external connection methods have small error
- 4. The internal resistances of small range ammeter g, ammeter A and voltmeter V are RG, RA and RV respectively A. RG＜RA＜RVB. RV＜RA＜RGC. RA＜RG＜RVD. RG＞RV＞RA
- 5. The voltage at both ends of a conductor is 12 volts, and the current intensity passing through it is 0.9 amperes, so that the current intensity passing through it is 0.6 amperes, and the voltage applied at both ends of it should be more than 10 amperes
- 6. There is an ammeter with an internal resistance of 1 ohm and a measuring range of 1 A. if you want to expand the measuring range to 5 A, what kind of resistance should be connected? Is it in series or in parallel?
- 7. How many kilowatts of electrical appliances can 4 square millimeter copper wire use
- 8. How many catties of 16 square single strand copper core wire per meter How many jin copper per meter of 16 square single strand copper core wire?
- 9. What is converted from chemical energy to electrical energy?
- 10. Does nuclear power plant convert chemical energy into electrical energy?
- 11. If the indication of the ammeter increases by 4 times, R? Ohm resistance should be given Such as the title Better have an explanation
- 12. Measure the resistance with missing meter method, from the positive pole to the resistance RO and then to Rx, ammeter, switch to the negative pole, RX and RO are connected in parallel, and Rx resistance value is calculated with known power supply voltage ro resistance value
- 13. In the circuit shown in the figure, both ammeter and voltmeter are ideal ammeter. If resistance R1 is open circuit, the following statements are correct () A. The current indicates that the number becomes smaller; B. the voltage indicates that the number becomes larger; C. the power consumed by R3 becomes larger; D. the power consumed by the circuit in the power supply becomes larger
- 14. What can an ammeter measure besides the current?
- 15. What do the poles and zeros of a filter mean
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- 18. In the study of microscopic particles, electron volt (EV) is often used as the unit of energy. 1eV is equal to the kinetic energy of an electron accelerated by 1V voltage. Please deduce the conversion relationship between electron volt and Joule
- 19. In the motor model, the coil resistance is 1 ohm, the voltage at both ends is u = 2 V, and the current in normal operation is 0.8 ampere 1. Electric energy consumed in 1min when small motor works normally 2. The internal energy produced in 1min when the small motor works normally? 3. The mechanical energy produced in 1min when the small motor works normally? 4. Heating power of small motor in normal operation? 5. Total power of small motor in normal operation? 6. Output power of small motor in normal operation?
- 20. When the coil resistance of a motor is 1 ohm, the voltage applied at both ends of the coil is 2V, and the current is 0.8A, the electric energy consumed by the motor in normal operation for one minute is____ J, What is the converted mechanical energy J