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What is the voltage of an ordinary dry battery? What is the voltage for human safety?
Dry cell 1.5 V safe voltage 36 V
The resistance of the electric pen is known to be 1500 kiloohm, and the current and voltage passing through the human body are calculated
220 / 1.5 = 146 μ A. human body resistance can be ignored here, so can voltage
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- 1. There must be a large resistance in the test pen to limit the current passing through the human body There must be a large resistance in the electric pen to limit the current passing through the human body. The resistance of the electric pen is 880k Ω. The resistance of the neon tube and the resistance of the human body are both small. How much current is flowing through the human body
- 2. There is a large resistance in the test pen, which is used to limit the current passing through the human body The resistance of neon tube and human body is not taken into account. How big is the current flowing through human body when the pen is used?!
- 3. If the minimum resistance of the human body is 1200 Ω, what is the maximum voltage allowed to be applied to the human body
- 4. Why is the light bulb dark during peak hours? (assuming the power supply voltage is constant, is it related to resistance?)
- 5. Three bulbs with different rated power and voltage are connected to the 220 V circuit respectively. Which bulb is brighter or the same? (please explain the reason)
- 6. The resistance of a 220 V 100 W incandescent lamp at room temperature is 40 ohm. What is the electric power at the moment of switching on
- 7. A fuse with a rated current of 5A is installed on the circuit of? 220 V electric lamp. In this circuit, a fuse with a rated current of 40 W can be installed at most
- 8. What is the difference between the rated current and the fusing current of a fuse? What is the difference between them? Which fuse should be compared with the maximum current in the home circuit?
- 9. An electric iron working at rated voltage has a power of 100W and a current of 454ma. What is the total rated power of the electric iron?
- 10. Why do wires with high resistance produce more heat
- 11. The voltage of home circuit is () V, that of a dry battery is () V, and that of silver oxide battery for electronic watch is () V, which is safe for human body
- 12. Connect 15 watt and 100 watt bulbs to the circuit respectively, and compare the speed of the meter dial rotation. What is the speed of the meter dial rotation?
- 13. Is it OK for a 100 watt 220 volt bulb and a 40 Watt 220 negative bulb to jump in the 380 negative circuit? Why Who knows why you can and why you can't tell me how to calculate it? Thank you here I know, but can I take it? You didn't say that. I don't know what to do
- 14. Voltage of lighting circuit in China
- 15. Two bulbs marked "220 V, 40 W" are connected in series and then connected to 220 V power supply. The actual power consumption is? The answer, I know, is 20 watts,
- 16. The resistance of the inductance coil of AC contactor is 220 ohm and the inductance is 10h. When it is connected to the AC power supply with voltage of 220 V and frequency of 50 Hz, how much current is in the coil? If the contactor is accidentally connected to the DC power supply with voltage of 220 V, how much current will be in the coil? If the allowed current of the coil is 0.1 A, will there be consequences?
- 17. The capacitance of 10uF is connected with sinusoidal voltage with frequency of 50Hz and 5000Hz successively, and the effective value of voltage is 220V. The capacitive reactance and current of the capacitance in two cases are calculated
- 18. How many kilowatts of electricity does a fan with voltage of 220 V ~ frequency of 50 Hz need to operate for 12 hours? Ceiling fan~
- 19. In the 220 V lighting circuit, install the same color lamp, and the normal working voltage of each lamp is 13.5 v If a lamp is burned out, one is to give you an ammeter and a wire, and the other is to give you a voltmeter. How do two methods measure which lamp is broken?
- 20. Circuit diagram of 220 V AC to 12 V DC Without voltage regulator IC, the diagram should be as simple as possible