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All Formulas of Electricity

This document outlines key formulas related to electricity for Class X CBSE students in India, including calculations for current, voltage, resistance, power, and energy. It also provides information on measuring devices and essential units of measurement. Additionally, it covers concepts like resistivity and combinations of resistances in series and parallel circuits.

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ahmed.pat2007
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340 views2 pages

All Formulas of Electricity

This document outlines key formulas related to electricity for Class X CBSE students in India, including calculations for current, voltage, resistance, power, and energy. It also provides information on measuring devices and essential units of measurement. Additionally, it covers concepts like resistivity and combinations of resistances in series and parallel circuits.

Uploaded by

ahmed.pat2007
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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All Formulas of Electricity: Class X CBSCE BOARD INDIA

1) I = Q / t [ Q = Charge ] [ t = time taken ]

2) Q = ne

3) V = W/Q (or) V = E/Q [ E = Energy, W = Work done ]

4) V = IR

5) R = Rho () x L / A (or) R=V/I [ ρ = Resistivity, l = length, A = Area ]

6) Resistance in Series: Rs = R1 + R2 + R3…

7) Resistance in Parallel: 1/Rp = 1/R1 + 1/R2 + 1/R3… (» Reciprocal of R1+R2+R3…)

8) H = V × Q i) H = VIt ii) H = I²Rt iii) H = V²t/R

9) P = W/t i) P = VI ii) P = I²R iii) P = V²/R

10) E = P × t

S.I. Units:
Current ( I ) – Ampere ( A )

Charge ( Q ) – Coulomb ( C )

Work or Energy ( W ) – Joule ( J )

Time ( t ) – Second ( s )

Voltage (Potential Difference) [ V ] – Volts ( V )

Resistance ( R ) - Ohm ( Ω )

Resistivity ( Rho /  ) - Ohm meter ( Ω m )

Power ( P ) – Watt ( W )

Heat = Energy = Work = Joule

Measuring Devices:
Ammeter / Milli Ammeter - for measuring current (always connected in series)

Voltmeter - for measuring volts (always connected in parallel)

Galvanometer - for measuring small/sensitive currents (we can also get the direction of the current)

Ohm Meter - Measures the resistivity

Things to remember:
Electron charge = ( 1.6 x 10⁻¹⁹ C)

1kWh= 3.6 × 10⁶J

1Ampere = 1000mA

1 Kilowatt = 1000W

1 Horse Power = 746W


Electric Current and Circuit :- Other Formulas

1. Kilowatt-hour (kWh):
1. Ohm's Law: 1 kWh = 1000 Wh = 3.6 x 10^6 J
- V = IR (Voltage = Current x Resistance)

- I = V/R (Current = Voltage / Resistance) 2. Fuse and Circuit Breaker:


- R = V/I (Resistance = Voltage / Current) - I = V/R (Current = Voltage / Resistance)

2. Power: Units and Conversions


- P = VI (Power = Voltage x Current) 1. Volt (V)
- P = I^2R (Power = Current^2 x Resistance) 2. Ampere (A)
- P = V^2/R (Power = Voltage^2 / Resistance) 3. Ohm (Ω)

4. Watt (W)
3. Energy: 5. Joule (J)
- E = Pt (Energy = Power x Time) 6. Kilowatt-hour (kWh)
- E = VIt (Energy = Voltage x Current x Time)

Resistance and Resistivity

1. Resistivity:

p = RA/I (Resistivity = Resistance x Area /

Length)

2. Resistance:

- R = pl/A (Resistance = Resistivity x Length /

Area)

3. Combination of Resistances:

Series: R_total = R1 + R2 + + Rn

Parallel: 1/R_total = 1/R1 + 1/R2 + + 1/Rn

Electric Potential

1. Electric Potential:

- V = W/q (Voltage = Work / Charge)

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