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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/R T )=(1/R 1 )+(1/R 2 )+(1/R 3 ), therefore the total resistance is 1.25ohms. Therefore the current is simply I T =V...
HM
Answered by Harrison M. • Physics tutor
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How do you work out the direction and strength of the force on a current carrying wire in a magnetic field?

The magnitude of the force is given by F = BILsin(θ) . I is the current flowing through the wire, L is the length of the wire in the magnetic field and B is the magnetic field strength. The angle θ, is the a...
AP
Answered by Adam P. • Physics tutor
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State similarity and difference between the electric field lines and the gravitational field lines around an isolated positively charged metal sphere.

The lines are radial and as distance increases from the sphere the further away the lines get from each other in both. The differences are that gravitational lines are directed towards the sphere and electri...
TS
Answered by Trishi S. • Physics tutor
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Two pendulums consist of a massless rigid rod of equal length attached to a small sphere of equal radius, with one sphere hollow for one pendulum and the other solid. Each pendulum undergoes damped SHM. Which pendulum has the largest time period?

This question requires a qualitative answer seeing as we do not have an expression for the time period of a pendulum undergoing damped SHM. This is what the examiners will be expecting.There are a few differ...
CG
Answered by Callum G. • Physics tutor
2379 Views

3 resistors, R1, R2 and R3 are attached in parallel across a 6V cell with resistances 3, 4 and 5 Ohms respectively. Calculate the current across each resistor.

First off draw the circuit. The voltage across each resistor is equal (i.e. 6V). From here we just have to use Ohm's law (V = I x R) to calculate the currents across each resistor. This gives us: R1; 6V = I ...
MP
Answered by Marcus P. • Physics tutor
3455 Views