3 WAYS TO INCREASE THE STRENGTH OF AN ELECTROMAGNET * INCREASE NUMBER OF COILS THAT WRAP AROUND THE CORE * INCREASE THE CURRENT FLOWING THROUGH THE COIL * CHANGE THE CORE MATERIAL TO BEST SUIT THE ELECTROMAGNET
4 things i found hard i found everything hard in the exam
Tuesday, May 18, 2010
redraw R3, R4, R5 to make one resistor in a parallel circuit with R2, then add the inverse of R2 with the inverse of R3+R4+R5 the inverse the answer then you should now have 3 resisters in series then add them together to give you the total resistance. now if you use ohms law I=V/R you can work out the current through the circuit at each resistor an also the voltage across each resistor.
Tuesday, May 11, 2010
Total voltage is the same as the supply voltage on every branch of the circuit. Total Resistance = 1/R1 + 1/R2 = 1/RT Current breaks of down the branches of the circuit then rejoins to the supply current.