What is the typical power consumption of field instruments?

The formula for calculating power is P=UI. Another formula for power is p=w/t; P=UI, P=I^2*R, P=Fv, P=U^2/R. The formula for work is: W=Fs, W=UIt, W=I^2*Rt, W=U^2*t/R. 1. The method for calculating the power of two-phase household appliances is: P=current*voltage*power factor. For example, 5A current * 220V AC voltage * 0.9 power factor = 990W. 1 kilowatt-hour equals 1000W. 2. The method for calculating the power of symmetrical three-phase AC household appliances is: Active power (W): P=√3*current*AC voltage*power factor (COS). Reactive power (VAR): Q=√3*current*AC voltage*power factor (SIN). Apparent power (VA): S=√3*current*AC voltage. P represents power, with the unit being “watt”, abbreviated as “W”, and denoted by the symbol “W”. W represents work, with the unit being \"joule\", abbreviated as \"J\", and its symbol is \"J\". t represents time, with the unit being ‘seconds’, denoted by the symbol ‘s’. Since W = F (force) * s (distance) (the definition of work), the formula for power can also be derived as P = F · V (where F is force and V is velocity). The greater the power, the higher the speed; consequently, the car’s top speed also increases. Maximum power is commonly used to describe a car’s performance in terms of power. Maximum power is generally expressed in horsepower (PS) or kilowatts (kw), with 1 horsepower equal to 0.735 kilowatts. 1W = 1J/s; P = W/t = FV = FL/t. 1. In a series circuit, the current and voltage follow these rules: (for example, R1 and R2 in series) ① Current: I = I1 = I2 (the current is the same everywhere in a series circuit). ② Voltage: U = U1 + U2 (the total voltage equals the sum of the voltages across each component). ③ Resistance: R = R1 + R2 (the total resistance equals the sum of the individual resistances). If n resistors with the same value are connected in series, then R_total = nR. 2. In a parallel circuit, the current and voltage follow these rules: (for example, R1 and R2 in parallel) ① Current: I = I1 + I2 (the current in the main circuit equals the sum of the currents in each branch). ② Voltage: U = U1 = U2 (the voltage in the main circuit is the same as the voltage in each branch). ③ Resistance: The reciprocal of the total resistance equals the sum of the reciprocals of the individual parallel resistors. If n resistors with the same resistance value are connected in parallel, then R_total = R. Note: The total resistance of a parallel circuit is smaller than the resistance of any individual branch. Formula for calculating electrical work: W=UIt (where the unit of W is joule (J)) ； U→Volts (V) ； I→An(A) ； t→seconds). 5. When using W=UIt to calculate electrical work, note that: ① In the formula, W, U, I, and t refer to the same circuit segment ； ②Keep the units consistent when calculating ； ③It is known that the fourth quantity can be determined from any three quantities. 6. Electric work can also be calculated using the following formula: W=I2Rt ； W=Pt ； W=UQ (Q is the charge amount) ； 【Electrical Section】 1. Current intensity: I = Q/t 2. Resistance: R = ρL/S 3. Ohm’s law: I = U/R 4. Joule’s law: ⑴ Q = I²Rt (general formula); ⑵ Q = UIt = Pt = U²t/R (formula for pure resistors) 5. Series circuits: ⑴ I = I₁ = I₂; ⑵ U = U₁ + U₂; ⑶ R = R₁ + R₂; ⑷ U₁/U₂ = R₁/R₂ (voltage division formula); ⑸ P₁/P₂ = R₁/R₂ 6. Parallel circuits: ⑴ I = I₁ + I₂; ⑵ U = U₁ = U₂; ⑶ 1/R = 1/R₁ + 1/R₂; ⑷ I₁/I₂ = R₂/R₁ (current division formula); ⑸ P₁/P₂ = R₂/R₁ 7. Fixed resistors: ⑴ I₁/I₂ = U₁/U₂; ⑵ P₁/P₂ = I₁²/I₂²; ⑶ P₁/P₂ = U₁²/U₂² 8. Electrical work: ⑴ W = UIt = Pt = UQ (general formula); ⑵ W = I²Rt = U²t/R (formula for pure resistors) 9. Electrical power: ⑴ P = W/t = UI (general formula); ⑵ P = I²R = U²/R (formula for pure resistors)

Thanks for the answer! That’s how the formula for calculating work is used. Could you roughly tell me the specific power or power consumption of instruments like these on site? Let’s give an introduction to the power consumption and usage patterns of the instruments we often encounter, such as those from Rosemount, ASCO solenoid valves, Widmer relay, and Omron thermal relays! Thank you

Thank you! I need to take a good look to figure it out.

Go and take a look at some samples of the relevant instruments