Electric Circuits Answers

The circuit below shows two resistors, whose resistance are 0.40ohms & 0.60ohms connected in parallel they are apart of a circuit which carries a current I and the current 0.40ohms resistor is 1.50A

............/~~~0.40ohm~~\.............
....i....../°1.50A...................\......i.....
_>___./.................................\.__>__
.....A °\............................... °/ B.......
...........\~~~0.60ohm~~~/............

....draw but don't include the dots...

Calculate
(I) the potential difference between point mark A and B in the diagram ..
(ii) The current i in the 0.60ohm resistor
(iii) the current i in the circuit.

The circuit below shows two resistors, whose resistance are 0.40ohms & 0.60ohms connected in parallel they are apart of a circuit which carries a current I and the current 0.40ohms resistor is 1.50A

/~~~0.40ohm~~\
i /°1.50A \ i
_>___./ \.__>_
A °\ °/ B
\~~~0.60ohm~~ /

Calculate
(I) the potential difference between point mark A and B in the diagram ..
(ii) The current i in the 0.60ohm resistor
(iii) the current i in the circuit.

A galvanometer has a full scale defection of 1.0A and internal resistance of 0.5ohms, if it is connected to a current of 30 A, calculate the value of resistance of shunt required with the meter without damaging it

Three cells (EMF =9V) are connected in series to a 4 ohms light bulb. If the resulting current is 0.65 A, what is the internal resistance of each cell, assuming they are identical and neglecting the wires?

A generator develops a maximum voltage of 150 V. A 60 W light bulb is placed across the generator. A maximum current of 0.70 A flows through the bulb.

A) What is the effective rms voltage?

B) What effective rma current flows through the bulb?

C) What is the resistance of the light bulb when it is working?

A battery of four cells each of e.m.f 1.5V and internal resistance 1.0ohms is connected to a 1ohm resistor in series with a parallel combination of two 2ohms resistors. Draw the circuit diagram and calculate:
a) the combined external resistance.
b) the current in the circuit
c) the lost volts in the battery
d) the current in one of the two resistors.

1. Calculate the total energy provided e.m.f of 3.0V when it causes a steady current of 0.30A to flow for 30 minutes through an electric bulb. If the battery had an internal resistance of 2.00 ohms, calculate the heat energy dissipated in the bulb at the same time.

2. The resistance of a wire of length 66m and diameter 0.14m is 10. Calculate the conductivity of the material of the wire. (take pi=22/7)

A balanced delta connected load takes 20 KVA at 0.8 power factor when connected to a 415 v, 3 sigma system.Calculate the resistance of each branch of balanced star connected non reactive load which when connected to same supply coil takes the same power?

A transformer rated at a maximum power of 10 kW is used to connect a 5000 V transmission line to a 240 V circuit. (a) Find the ratio of turns in the windings of the transformer. [4] (b) Calculate the maximum current in the 240 V circuit.

If only 1/51 th of the main current is to be passed through a galvanometer then the shunt required is R1 and if only 1/11 th of the main voltage is to be developed across the galvanometer, then the resistance required is R2. Then R2/R1=