Advertisements
Advertisements
Question
In series combination of resistances ______.
Options
p.d. is same across each resistance
total resistance is reduced
current is same in each resistance
all of the above are true
Advertisements
Solution
In series of combinations of resistances current is same in each resistance.
Explanation:
In a series combination, the current has a single path for its flow. Hence, the same current passes through each resistor.
APPEARS IN
RELATED QUESTIONS
Find the equivalent resistance between A and B
Draw a V-I graph for a conductor at two different temperatures. What conclusion do you draw from your graph for the variation of resistance of conductor with temperature?
A graph is plotted taking p.d. along y-axis and electric current along x-axis. Name the physical quantity that represents the slope of this graph (Fig.).
What potential difference is needed to drive a current o f 1 A through a 5 Ω resistor?
Answer the following question.
While studying the dependence of potential difference ( V) across a resistor on the current (I) passing through it, in order to determine the resistance of the resistor, a student took 5 readings for different values of current and plotted a graph between V and t. He got a straight line graph passing through the origin. What does the straight-line signify? Write the method of determining the resistance of the resister using this graph.
Two lamps of resistance 30Ω and 20Ω respectively are connected in series in a 110V circuit. Calculate:
(i) the total resistance in the circuit
(ii) the current in the circuit, and
(iii) the voltage drop across each lamp.
Illustrate-combination of cells e.g., three cells, in series, explaining the combination briefly. Obtain an expression for current ‘i’ in the combination.
Illustrate-combination of cells e.g., three cells, in parallel, explaining the combination briefly. Obtain an expression for current ‘i’ in the combination.
If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be:
