PHYSICAL QUANTITY
Electric current: formulas and units of measurement
Electric current: symbol I, unit A. Formulas and explanations for Electricity.
II\text{А}ampere
KEY CONNECTIONS
Formulas
I=\frac{q}{t}I = q / t
I=\frac{U}{R}I = U / R
I=\frac{\mathcal{E}}{R+r}I = ε / (R + r)
I=qnvSI = qnvS
j=\frac{I}{S}j = I / S
m=k_{\text{эл}}Itm = kэлIt
NOTATION
Quantities in formulas
- I
- Current strength is the charge passing through the cross section of a conductor per unit time.
- q
- Electric charge is a quantity that determines the participation of a body in electrical interaction.
- t
- Time is a quantity characterizing the duration and sequence of events.
- U
- Electric voltage is the work done by the electric field when transferring a unit charge.
- R
- Electrical resistance is a measure of a conductor's resistance to electric current.
- \mathcal{E}
- Electromotive force is the work of external forces during the transfer of a unit charge.
- r
- Internal resistance is the resistance of the electric current source.
- n
- Concentration is the number of particles per unit volume.
- v
- Velocity is the rate and direction of change of a body's position.
- S
- Area is the size of a surface or cross section.
- j
- Current density is the current strength per unit cross-sectional area.
- m
- Mass is a scalar physical quantity that is a measure of the inertia of a body.
- k_{\text{эл}}
- Electrochemical equivalent is the mass of a substance released by a unit charge.
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