CBSE Class 10 - Electricity - Important formulae

 
 Important information/formulae

Sr. No.	Description	Formula	More information
1	Relationship between current and charge	𝑰=	Where, I – current Q – charge t – time
2	Relationship between potential difference, work done and charge	𝑽=	Where, V – potential difference W – work done Q – charge
3	Ohm’s law	V = IR	Where, V – potential difference I – current R – Resistance
4	Resistance	𝑹 =	Where, R – resistance of a wire l – length of the wire A – cross-section area of the wire ρ – resistivity of the conducting material of the wire
5	Electric power	P = VI Or P = I2R Or P =	Where, P – electric power V – potential difference I – current R – resistance of the conductor
6	Joule’s law of heating	H = I2Rt	Where, H – heat energy I – current R – resistance t – time
7	System of 3 resistors connected in series	Rs = R1 + R2 + R3	Where, Rs - Effective resistance of the series combination of three resistors R1, R2 and R3
8	System of 3 resistors connected in parallel	=  +  +	Where, Rp – Effective resistance of the parallel combination of the three resistors R1, R2 and R3