A circuit with a voltage source of 18V, has 3 resistors all connected on parallel, values at 2ohms, 6ohms and 7.5ohms. Find the total circuit resistance, and then subsequently, the total current supplied and power dissipated in the curcuit.
The total resistance is found by the addition of resistors in parallel, in the equation (1/RT)=(1/R1)+(1/R2)+(1/R3), therefore the total resistance is 1.25ohms. Therefore the current is simply IT=VS/RT, which gives us a current of 14.4A, and using P=IxV, the power dissipated is 259.2W.
HM
Related Physics A Level answers
All answers ▸Draw the electric field lines produced by a negative point charge and calculate the electric field strength at a distance of 50mm from a point charge of size -30nC.
A ball is thrown up with an initial velocity of 8 m/s and initial height of 1.5m above the ground. Calculate the maximum height the ball reaches and the time it takes to get there.
Describe the interaction that is responsible for keeping protons and neutrons together in a stable nucleus.
What is the minimum frequency of electromagnetic radiation needed for a photon to ionise an atom of sodium? ( An atom of sodium has an ionisation energy of 5.15 eV.)