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Drift Speed Formula

GoDrift Speed given Cross-Sectional Area Formula

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Drift Speed is the average velocity of electrons in a conductor, which is responsible for the flow of electric current. Check FAQs

V d = \frac{E \cdot 𝛕 \cdot [Charge-e]}{2 \cdot [Mass-e]}

V_d - Drift Speed?E - Electric Field?𝛕 - Relaxation Time?[Charge-e] - Charge of electron?[Mass-e] - Mass of electron?

Drift Speed Example

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With units

Only example

Here is how the Drift Speed equation looks like with Values.

Here is how the Drift Speed equation looks like with Units.

Here is how the Drift Speed equation looks like.

2.6E+17 = \frac{60 \cdot 0.05 \cdot 1.6E-19}{2 \cdot 9.1E-31}

2.6E+17mm/s = \frac{60V/mm \cdot 0.05s \cdot 1.6E-19C}{2 \cdot 9.1E-31kg}

2.6E+17 = \frac{60 \cdot 0.05 \cdot 1.6E-19}{2 \cdot 9.1E-31}

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Drift Speed Solution

Follow our step by step solution on how to calculate Drift Speed?

FIRST Step Consider the formula

V d = \frac{E \cdot 𝛕 \cdot [Charge-e]}{2 \cdot [Mass-e]}

Next Step Substitute values of Variables

∴

V d = \frac{60V/mm \cdot 0.05s \cdot [Charge-e]}{2 \cdot [Mass-e]}

Next Step Substitute values of Constants

∴

V d = \frac{60V/mm \cdot 0.05s \cdot 1.6E-19C}{2 \cdot 9.1E-31kg}

Next Step Convert Units

∴

V d = \frac{60000V/m \cdot 0.05s \cdot 1.6E-19C}{2 \cdot 9.1E-31kg}

Next Step Prepare to Evaluate

∴

V d = \frac{60000 \cdot 0.05 \cdot 1.6E-19}{2 \cdot 9.1E-31}

Next Step Evaluate

∴

V d = 263823003408586m/s

Next Step Convert to Output's Unit

∴

V d = 2.63823003408586E+17mm/s

LAST Step Rounding Answer

∴

V d = 2.6E+17mm/s

Drift Speed Formula Elements

Variables

Constants

Drift Speed

Drift Speed is the average velocity of electrons in a conductor, which is responsible for the flow of electric current.

Symbol: V_d

Measurement: SpeedUnit: mm/s

Note: Value can be positive or negative.

Formulas to find Drift Speed

Electric Field

Electric Field is the force per unit charge at a given point in space, created by the presence of electric charges or changing magnetic fields.

Symbol: E

Measurement: Electric Field StrengthUnit: V/mm

Note: Value can be positive or negative.

Formulas to find Electric Field

Relaxation Time

Relaxation time is the time taken by the current in a circuit to decay to a certain fraction of its initial value.

Symbol: 𝛕

Measurement: TimeUnit: s

Note: Value can be positive or negative.

Formulas to find Relaxation Time

Charge of electron

Charge of electron is a fundamental physical constant, representing the electric charge carried by an electron, which is the elementary particle with a negative electric charge.

Symbol: [Charge-e]

Value: 1.60217662E-19 C

Mass of electron

Mass of electron is a fundamental physical constant, representing the amount of matter contained within an electron, an elementary particle with a negative electric charge.

Symbol: [Mass-e]

Value: 9.10938356E-31 kg

Other Formulas to find Drift Speed

Go Drift Speed given Cross-Sectional Area

V d = \frac{I}{e - \cdot [Charge-e] \cdot A}

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J = σ \cdot E

How to Evaluate Drift Speed?

Drift Speed evaluator uses Drift Speed = (Electric Field*Relaxation Time*[Charge-e])/(2*[Mass-e]) to evaluate the Drift Speed, Drift Speed formula is defined as a measure of the average velocity of electrons in a conductor, which is influenced by the electric field and the properties of the conductor, providing insight into the behavior of electrons in electrical circuits. Drift Speed is denoted by V_d symbol.

How to evaluate Drift Speed using this online evaluator? To use this online evaluator for Drift Speed, enter Electric Field (E) & Relaxation Time (𝛕) and hit the calculate button.

FAQs on Drift Speed

What is the formula to find Drift Speed?

The formula of Drift Speed is expressed as Drift Speed = (Electric Field*Relaxation Time*[Charge-e])/(2*[Mass-e]). Here is an example- 2.6E+20 = (60000*0.05*[Charge-e])/(2*[Mass-e]).

How to calculate Drift Speed?

With Electric Field (E) & Relaxation Time (𝛕) we can find Drift Speed using the formula - Drift Speed = (Electric Field*Relaxation Time*[Charge-e])/(2*[Mass-e]). This formula also uses Charge of electron, Mass of electron constant(s).

What are the other ways to Calculate Drift Speed?

Here are the different ways to Calculate Drift Speed-

Drift Speed=Electric Current/(Number of Electrons*[Charge-e]*Cross-Sectional Area)

Can the Drift Speed be negative?

Yes, the Drift Speed, measured in Speed can be negative.

Which unit is used to measure Drift Speed?

Drift Speed is usually measured using the Millimeter per Second[mm/s] for Speed. Meter per Second[mm/s], Meter per Minute[mm/s], Meter per Hour[mm/s] are the few other units in which Drift Speed can be measured.

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Drift Speed Formula

​GoDrift Speed given Cross-Sectional Area Formula

Drift Speed Example

Drift Speed Solution

Drift Speed Formula Elements

Other Formulas to find Drift Speed

Other formulas in Basics of Current Electricity category

How to Evaluate Drift Speed?

FAQs on Drift Speed

Variable Name

GoDrift Speed given Cross-Sectional Area Formula