1, a pure resistance circuit is a circuit that contains only resistance components, and is composed of a power supply, a resistance and a wire connecting the circuit. In a pure resistance circuit, there are only resistance components in addition to the power supply, or there can be inductive and capacitive components, but the effect of these on the circuit is negligible. The role of the power supply in a pure resistance circuit is to provide electrical energy, while the resistance is used to limit the size of the current, and the wire is used to connect the power supply and the resistance.
2, pure resistance circuit is in addition to the power supply, only resistance components of the circuit, or inductor and capacitor components, but theyThe effect on the circuit is negligible. Voltage and current are in the same frequency and phase. The resistance converts all the energy obtained from the power supply into internal energy, and this circuit is called a pure resistance circuit. An impure resistance circuit is a circuit that emits heat and performs other forms of work in addition to internal energy in the energized state.
3, pure resistance circuit is in addition to the power supply, only resistance components of the circuit, or inductor and capacitor components, but their impact on the circuit can be ignored. Voltage and current are in the same frequency and phase. Basically, as long as the electrical energy is converted into no other energy than internal energy, the circuit is a pure resistance circuit. bulbThe circuit can be approximately regarded as a pure resistance circuit, because the incandescent lamp converts more than 90% of the electrical energy into heat energy, and only very little into light energy.
4, only a pure resistance circuit is called a pure resistance circuit, that is, does not include motor, diode, transistor, inductor, capacitor and other circuits that have other effects on the current. In a pure resistance circuit, the resistance converts all the energy obtained from the power supply into internal energy, and Ohm's law and Joule's law are only suitable for pure resistance circuits.
According to the information you provided, a 72 volt 20 amp electric vehicle requires about 152 KWH to be fully charged. Specifically, the battery capacity of the electric vehicle is 72v20ah, and the power capacity is P=UI=72*20=1440wh=44kwh (degree), the actual charge is generally 05 times the ideal discharge, so the 72v20ah charge consumes about 512 degrees of electricity (44*05).
Assuming the charging speed of the charger is 3a, then the time (hours) required for 72v20ah to be fully charged = (battery capacity AH/ charging currentA), that is, 20/3=66 hours full. But consider the late small current floating charge. It is generally required to charge for about 8 hours. Charging can not exceed 12 hours at most, 10 hours at most, and occasionally once or twice does little damage to the battery.
A volt 20 A electric vehicle fully charged about 152 KWH of electricity. 1 degree =1 kw ·h One degree of electricity (kw*h) is 1 kW * per hour. 1W=1A*1V P=U*I 20Ah*72V=1440W·h=44KW·h=44 degrees = 0.144kW, 0.144 degrees for an hour of charging. It takes eight hours to fully chargeThat's 152 kilowatt-hours.
v20a battery car charging for 1 hour needs to use 0.15~0.20 degrees of electricity, 10 hours of charging a total of about 7 degrees of electricity, depending on the size of the charger power, but full of about 5 degrees of electricity, the theoretical value is 44 degrees, the charger itself has a certain loss, the electric vehicle charging time after full discharge is generally about 10 hours. A charge is about 63 kilowatt-hours.
A full charge requires about 35 KWH. Electric vehicle battery charge is generally 05 times the capacity of the battery, according to the charging voltage calculation, electricity consumption = charging voltage * rated capacity of the batteryHigh. More than 90% of the battery's power is charged at this stage.
Is it always worried about mobile phone battery charging uit wireless charging , or charging too long to damage the mobile phone? Don't worry, let's give you a popular science mobile phone battery charging time calculation method Say goodbye to anxiety no longer worry about mobile phone battery charging dissatisfaction or charging too long problem, master this algorithm, say goodbye to anxiety. With a simple calculation, you can easily master the calculation method of mobile phone battery charging time.
Calculation formula: 0*4/1000=0.012 yuan1 degree of electricity is a certain amount of electrical energy, energy is equal to power times time, electric power is equal to current strength times voltage, the capacity unit of the battery is not MA, MA hours, has uit wireless charging the unit time concept in it, the general mobile phone battery nominal voltage is 7 volts, the value is 4, kilowatt-hour is 1 degree, So divide by 1000.
Charging time calculation formula: charging time = battery capacity ÷ charging current ×2. Charging is an essential operation in our daily lives, whether it is mobile phones, tablets, electric vehicles or other electronic devicesAll need to be charged to continue to use. However, incorrect charging methods can lead to safety incidents, shortened battery life, or reduced charging efficiency. Therefore, the following points need to be noted when charging.
The charge time is (1200 mah / 600 mah) 1.2 = 2.4 hours, then the battery charge time using this charger is 2.4 hours. The above calculation method does not apply to new batteries.