Advertisements
Advertisements
Question
In series combination which remains constant?
(a) Voltage
(b) Current
(c) Both current and voltage
(d) Both are variables
Solution
(b) Current
When a potential difference is applied across a combination of resistors in series, the same current flows through each resistor.
APPEARS IN
RELATED QUESTIONS
If the equivalent resistance is to be increased, then the number of resistances should be connected in
- Series
- Parallel
- Mixed arrangement
- None of the above
Find the expression for resistors connected in series.
A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, then the ratio `"R"/"R'"` is ______.
How does the resistance of a wire change when:
its diameter is tripled?
Calculate the combined resistance in each case:
If two resistors of 25 Ω and 15 Ω are joined together in series and then placed in parallel with a 40 Ω resistor, the effective resistance of the combination is :
(a) 0.1 Ω
(b) 10 Ω
(c) 20 Ω
(d)40 Ω
In series combination of resistances ______.
Choose the correct alternative and rewrite the following:
You are given three equal resistances. In how many combinations can they are arranged?
Bends in a rubber pipe reduce the flow of water through it. How would the bands in a wire affect its electric resistance?
State the effect of rise in temperature on the resistance of semi-conductors.
Define the term resistivity and state its S.I. unit. Which will have higher resistivity a conductor or an insulator.
Calculate the equivalent resistance between P and Q from the following diagram:
2Ω resistor A, 1Ω resistor B and 4Ω resistor C are connected in parallel. The combination is connected across a 2V battery of negligible resistance. Draw the diagram of the arrangement and calculate:
(i) The current in each resistor A and C,
(ii) The current through battery.
Illustrate-combination of cells e.g., three cells, in series, explaining the combination briefly. Obtain an expression for current ‘i’ in the combination.
Two wires of same material and same lengths have radii in the ratio of 2 : 3, Compare their resistances.
Show how you would connect three resistors, each of resistance 6 Ω, so that the combination has a resistance of 4 Ω.