Circuits

i learnt that a fuse should be 20% higher then the current flowing through it, for example 10volts should have a 12v fuse, and also that in a series circuit if one blub fuses the whole circuit will fail because the current cant flow through, but in a parrel ciruit it doesnt matter due to the fact the blubs are connect by two differnt wires


In partical we made our own circuits using a circuit board and a power source, i learnt the reason why if a bulb fuses in a series circuit the whole circuit fails, that because there is only one voltage supply to the circuit, therefore voltage must pass through all the consumers, and if one fails they all fail, all the resitance does'nt have to be the same.But in a parrel circuit if one consumer fails, the other one stil goes because the current flow splits, to go to the diffrent resistance, so if one fails the other one stil goes.i learnt that to do calculations in compound circuit always find out the total resistance of the parrel area first.




　
Here are some circuits: