Question

Parallel group resistance of 4 10 20 ohm and 15v battery connected then what is current

Answer 1

Answer:

magnitude of current will be 6ampere

Explanation:

since resistances are connected in parallel so

$resultant \: \frac{1}{r} = \frac{1}{4} + \frac{1}{10} + \frac{1}{20} = \frac{5 + 2 + 1}{20}$

$r = \frac{20}{5 + 2 + 1} = \frac{20}{8} = 2.5ohm$

$now \: as \: per \: ohms \: law \\ i = \frac{v}{r} = \frac{15}{2.5} = \frac{150}{25} = \frac{30}{5} = 6ampere$