Class 10 Exam > Class 10 Videos > To study the dependence of potential difference (V) across a resistor on the current (I)
To study the dependence of potential difference (V) across a resistor on the current (I) Video Lecture - Class 10
FAQs on To study the dependence of potential difference (V) across a resistor on the current (I) Video Lecture - Class 10
| 1. What is the relationship between potential difference and current in a resistor? |  |
Ans. The potential difference across a resistor is directly proportional to the current flowing through it. This relationship is described by Ohm's Law, which states that V = I * R, where V is the potential difference, I is the current, and R is the resistance of the resistor.
| 2. How does the resistance of a resistor affect the potential difference across it? | |
Ans. The resistance of a resistor determines how much potential difference is required to drive a certain amount of current through it. Higher resistance values require a larger potential difference to achieve the same current, while lower resistance values require a smaller potential difference for the same current.
| 3. Can the potential difference across a resistor be negative? | |
Ans. No, the potential difference across a resistor cannot be negative. Potential difference is a scalar quantity that represents the difference in electric potential energy between two points in a circuit. It is always measured as a positive value, indicating the direction of the flow of electric charge.
| 4. How can we measure the potential difference across a resistor? | |
Ans. The potential difference across a resistor can be measured using a voltmeter. The voltmeter is connected in parallel to the resistor, allowing it to measure the voltage difference between the two points across the resistor.
| 5. Why does the potential difference across a resistor increase with an increase in current? | |
Ans. The potential difference across a resistor increases with an increase in current because the resistor experiences a higher voltage drop. As the current increases, more electric charge flows through the resistor, and the resistor offers resistance to this flow. This resistance causes a voltage drop across the resistor, leading to an increase in the potential difference.
Text Transcript from Video
to study the dependence of potential
difference V across a resistor on the
current I passing through it and
determine its resistance also plot a
graph between V and I
a pirate is required dry cell with
terminals g6 ever-ready cell
ten pieces of thick insulated copper
wire with bare ends
single key or one-way key ammeter
voltmeter rheostat 10 ohm resistor of
approximately 2 ohm resistance sandpaper
procedure rub the bare ends of the
connecting wires with sandpaper so that
bright shining copper metal is seen
remove the plug from the one-way key
connect tightly the key the rheostat of
10 ohm only the ammeter and the resistor
in series with the connecting wires to
the dry cell
connect a Walt meter in parallel to the
resistor
make sure that positive and negative
terminals of voltmeter and ammeter are
connected correctly
if there is a zero error in ammeter or
Walt meter corrected with the help of
adjustment screw insert the black key
and check that ammeter and voltmeter
show deflection now adjust the slider of
the rheostat such that the ammeter shows
a current of zero point one zero ampere
read the value of potential difference
from the voltmeter record the values of
current and potential difference again
adjust the slider of the rheostat such
that ammeter shows a current of 0.20
ampere read the value of potential
difference from Walt meter and record it
repeat the experiment four more times
for the values of current zero point
three ampere
0.4 ampere
zero point 5 ampere and zero point six
ampere
and in each case read and record
potential difference remove the black
key after finishing experiment
calculate the mean resistance of the
resistor mean resistance of the resistor
equals total of the resistance in each
case a bond number of cases plot a graph
between V and I by taking V on y-axis
and I on x-axis
join all the points with the help of a
narrow line a straight line is formed
conclusions from table as the ratio of V
upon I is a constant quantity are
therefore V is directly proportional to
I this verifies Ohm's law which states
that potential difference at the ends of
a conductor is directly proportional to
the current flowing through it provided
all physical properties of the conductor
remain the same
the resistance of the conductor is the
ratio of potential difference and the
current from graph as graph is straight
line therefore V is directly
proportional to I this verifies the
Ohm's law the slope of the graph V by I
is the magnitude of resistance
difference V across a resistor on the
current I passing through it and
determine its resistance also plot a
graph between V and I
a pirate is required dry cell with
terminals g6 ever-ready cell
ten pieces of thick insulated copper
wire with bare ends
single key or one-way key ammeter
voltmeter rheostat 10 ohm resistor of
approximately 2 ohm resistance sandpaper
procedure rub the bare ends of the
connecting wires with sandpaper so that
bright shining copper metal is seen
remove the plug from the one-way key
connect tightly the key the rheostat of
10 ohm only the ammeter and the resistor
in series with the connecting wires to
the dry cell
connect a Walt meter in parallel to the
resistor
make sure that positive and negative
terminals of voltmeter and ammeter are
connected correctly
if there is a zero error in ammeter or
Walt meter corrected with the help of
adjustment screw insert the black key
and check that ammeter and voltmeter
show deflection now adjust the slider of
the rheostat such that the ammeter shows
a current of zero point one zero ampere
read the value of potential difference
from the voltmeter record the values of
current and potential difference again
adjust the slider of the rheostat such
that ammeter shows a current of 0.20
ampere read the value of potential
difference from Walt meter and record it
repeat the experiment four more times
for the values of current zero point
three ampere
0.4 ampere
zero point 5 ampere and zero point six
ampere
and in each case read and record
potential difference remove the black
key after finishing experiment
calculate the mean resistance of the
resistor mean resistance of the resistor
equals total of the resistance in each
case a bond number of cases plot a graph
between V and I by taking V on y-axis
and I on x-axis
join all the points with the help of a
narrow line a straight line is formed
conclusions from table as the ratio of V
upon I is a constant quantity are
therefore V is directly proportional to
I this verifies Ohm's law which states
that potential difference at the ends of
a conductor is directly proportional to
the current flowing through it provided
all physical properties of the conductor
remain the same
the resistance of the conductor is the
ratio of potential difference and the
current from graph as graph is straight
line therefore V is directly
proportional to I this verifies the
Ohm's law the slope of the graph V by I
is the magnitude of resistance
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