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junior college 1 | H3 Maths
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need a urgrent help..
Date Posted: 6 years ago
Views: 400
For parallel
Let Ra be resistance of resistor A and Rb be resistance of resistor B and Rf be resultant resistance
1/Ra+1/Rb=1/Rf
Let Rb be the 15 ohm resistor
1/Ra+1/15=1/5
(Ra+15)/15Ra=1/5
Ra+15=3Ra
2Ra=15
Ra=7.5ohm
Let Ra be resistance of resistor A and Rb be resistance of resistor B and Rf be resultant resistance
1/Ra+1/Rb=1/Rf
Let Rb be the 15 ohm resistor
1/Ra+1/15=1/5
(Ra+15)/15Ra=1/5
Ra+15=3Ra
2Ra=15
Ra=7.5ohm
thanks a lot
See 1 Answer
thanks a lot
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