^Rest & motion If position of body changes w.r.t. surroundings with the time then it is said to be moving otherwise at rest. Rest & motion are relative. A person sitting in a moving vehicle is at rest w.r.t. other persons in sitting same vehicle while is in motion w.r.t. other persons standing on road. […]
^Least count, accuracy & significant digits Suppose a rod is measured by a metre stick, and is estimated to lie between 1.6 and 1.8 m, then its length can be written as 1.7 m. It contains two significant digits, of which we are perfectly sure of the position of 1, but slightly doubtful regarding the […]
^Accuracy & Precision The accuracy of a measurement is a measure of how close the measured value is to the true value of the quantity. Precision tells us to what resolution or limit the quantity is measured. For example, suppose the true value of a certain length is near 3.678 cm. In one experiment, using […]
Mixed grouping of identical cells For maximum current
Two series cells in oppostions As the two cells are opposing thus ξnet =ξ1 – ξ2 , rnet = r1 + r2 V1 = ξ1 – Ir1, V2 = ξ2 + I r2
Two cells in parallel I = I1 + I2
n – cells in series As all the cell supply current in same direction thus
Power transferred theorem The power transferred by a cell to the load is maximum when R = r & given by Also then
Power delivered Power delivered by a dc circuit element can be calculated using the relation Using above relation we can say 1. The rate of heat generated in a wire is doubled when both the radius & length of the wire is doubled. 2. For constant voltage, the time taken to boil water by a […]
Power rating formula Resistance of a dc circuit element depends upon its rating in accordance with the relation, Using above relation we can say (a) A bulb of thin filament has more resistance. (b) A low wattage bulb has more resistance (filament thinner) than a high wattage bulb of same rated voltage. (c) Glow of […]
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