Formula for calculating current, formula for calculating current

1.Current intensity: i q t{i: current intensity (a), q: electric amount through the transverse surface of the conductor in time t (c), t: time (s)}

2.Ohm's law: i u r {i: conductor current intensity (a), u: voltage across the conductor (v), r: conductor resistance ( ).

3.Resistance, resistance law: r l s{ : resistivity ( m), l : length of the conductor (m), s : conductor cross-sectional area (m2)}

4.Ohm's law for closed circuits: i e (r+r) or e ir + ir can also be e u inside + u outside.

i: total current in the circuit (a), e: power supply electromotive force (v), r: external circuit resistance ( ) r: power supply internal resistance ( ).

5.Work and power: w uit, p ui{w: work (j), u: voltage (v), i: current (a), t: time (s), p: electric power (w)}

6.Joule's law: q i2rt{q: electric heat (j), i: current through the conductor (a), r: resistance value of the conductor ( ) t: energizing time (s)}

7.In pure resistive circuits: due to i u r, w q, w q uit i2rt u2t r

8.Total power supply momentum, power output power, power efficiency: P total IE, P out iu, P out p total {i: total circuit current (a), e: power supply electromotive force (v), u: road-end voltage (v), power efficiency}

9.Series-parallel circuits of circuits (p, you are proportional to r) and parallel circuits (p, i are inversely proportional to r).

Resistance relation r-string r1+r2+r3+ 1 r-parallel 1 r1+1 r2+1 r3+

Current relationship i, total i1, i2, i3, i, i1+, i2+i3+

Voltage relationship u, total u1+u2+u3+ u, total u1, u2, u3

Power distribution ptotal p1+p2+p3+ ptotal p1+p2+p3+

Current calculation formula: current x voltage = power; Current = power, voltage.

Current expression: The ratio of the amount of charge q passing through the cross-section of a conductor to the time t taken to pass through these amounts of charge is called the current, also known as the current intensity. i.e. i.e. i=q t.

If the amount of charge passing through the cross-section of the conductor in 1s is 1c, the current in the conductor is 1a. [8]

The microscopic quantity that determines the magnitude of the current: select two cross-sections B and C on a conductor Ad with uniform thickness with added voltage, let the cross-sectional area of the conductor be S, the number of free charges in each unit volume of the conductor is N, the amount of charge of each charge is E, and the directional movement rate of the charge is V, then all the free charges between the two sections B and C at a distance of Vt in time T will pass through the cross-section C.

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Kiss, the current calculation formula: current (i) = power (p) voltage (u) <><

There are two most basic ways to calculate the current formula, one is the electric power formula, p=ui, you can find the <>current if you know the electric power and working voltage of the electrical appliance

The formula for current and voltage is: i=u r, u=ir. Ohm's law: U=IR (i is the current, r is the resistance) but this formula only applies to pure resistive circuits <>

For example, a light bulb with an electrical power of 100 watts is normally working at 220 volts and a current of 100 watts 220 volts = amps. The second is to find the current i=u r according to the formula of Ohm's law, for example, a power appliance with a resistance of 50 ohms, the working current is: 220 volts 50 ohms = Anha<>