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CBSE Class 10 Answered

All formula of electricity   
Asked by vaishaliv3363.bmps | 02 Nov, 2020, 09:42: AM
Expert Answer
Formulae for Chapter Electricity: - 
 
Current, I = Q/t (Q - charge; t - time)
Potential difference, V = W/Q (W - Work done; Q - charge) 
Ohm's law:  -V = IR (V- potential difference; I - Current; R - Resistance) 
R = ρl/A (R - resistance; ρ - resistivity; l- length of conductor; A - Area of cross section) 
Resistances in Series: For n number of resistors connected in series- Equivalent resistance, Rs = R1 + R2 + R3 + ......Rn 
Resistances in Parallel: For n number of resistors connected in series-
Equivalent resistance,
1 over R subscript P equals 1 over R subscript 1 plus 1 over R subscript 2 plus 1 over R subscript 3...1 over R subscript n  
Heating effect of electric current 
Work done by the current in an electric circuit, W = VIt = I²Rt
W = V² t /R
This energy is exhibitedas heat. Thus, we have
H =VIt = I²Rt ....(Joule's Law of heating)
Electric Power, P = VI = I²R
P = V²/R 
Answered by Shiwani Sawant | 02 Nov, 2020, 12:44: PM

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