1.We have four resistors A ,B ,C and D of resistance 4 ohm,8 ohm ,12 ohm and 24 ohm
respectively?
Lowest resistance which can be
1
obtained by combining these four
resistors
highest resistance which can be
2
obtained by combining these four
resistors
Three resistors 5Ω, 10Ω and 30Ω are connected in parallel with the battery of
Voltage 6V?
S.no
Questions
The value of current across each
resistor
The value of Potential difference
2
across each resistor
3
Total current in the circuit
4
Effective resistance of the circuit
Solution
1
A1 ,A2 ,A3 and A are ammeters connected in the circuit
B1 ,B2 and B3 are three identical bulbs
They all are connected to Voltage source as shown in Figure
When the three bulb are working good and glowing ,the current recorded in Ammeter A is 6 A
Answer Following questions
a. Same amount of current will go through each Bulb. And the value is 2 A .True or False
b. If the Bulb B3is blown away, the bulb B1 and B2 will start glowing more. True or False
c. What will happen to all the ammeter reading if Bulb B1 is blown away
d. The current shown in Ammeter A remains even any bulb goes down. True or False
a.Define 1 volt. Express it in terms of SI unit of work and charge.
b. Calculate the amount of energy consumed in carrying a charge of 1 coulomb through a
battery of 3 volts.
When a resistor R is connected to a battery of 3 V, it draws a current of 1 ampere. find the value
of R. If an identical resistor is connected in parallel with it, find the current that flows through the
circuit?.
Establish a relationship to determine the equivalent resistance R of a combination of three
resistors having resistance R1, R2 and R3 connected in series. Calculate the equivalent
resistance of the combination of three resistors of 2 Ω, 3 Ω and 6 Ω joined in parallel.
a. What is meant by electric current? Name and define its SI unit.
b. In a conductor electrons are flowing from B to A. What is the direction of conventional
current? Give justification for your answer.