V is the level or magnitude of the voltage, hz is the frequency, generally refers to alternating current. Alternating current refers to the time when the voltage changes regularly from positive to negative, generally within one second. A refers to the amount of work done. The greater the work, the greater the current. W refers to the power, refers to the total work done by the voltage and current in a unit time.
v is the unit of voltage, A is the unit of current, w is the unit of electric power, Hz is the unit of AC frequency
Knowledge of single-phase electricity
1.1, the relationship between power consumption, power, current and voltage
A, power consumption unit: kilowatt-hour (KW ∙ H), referred to as "degree"
B, power (P) unit: watt, referred to as watt ( W)
C, current (I) unit: ampere, referred to as amp (A)
D, voltage (U) unit: volt, referred to as volt (V), household power supply is generally single-phase alternating current, the voltage is 220 volts; industrial power supply is Three-phase alternating current with a voltage of 380 volts.
E, power = current × voltage, that is, P = U × I
F, power consumption = power × power consumption time, that is, power consumption = P × T. The unit of power consumption is degrees, and 1 kWh refers to the power consumed by 1000 watts of power for 1 hour. Sign
1000W open for 1 hour with 1 kWh
85W open for 24 hours with 85 * 24/1000 = 2.04 kWh
2000W open for 24 hours with 2000 * 24/1000 = 48 kWh
Power P = 550W = 0.55kW, power consumption per hour W = Pt = 0.55 × 1 = 0.55 (kWh) = 0.55 degrees
If the electricity price per kWh is 0.60 yuan / kWh, the electricity fee is 0.6 × 0.55 = 0.33 yuan
