Advertisements
Advertisements
प्रश्न
What is the resistance of a conductor through which a current of 0.5 A flows when a potential difference of 2V is applied across its ends?
Advertisements
उत्तर
Given, I = 0.5 A
Potential difference, V = 2 V
Applying ohm's law, V = IR
Or, R = `"V"/"I" = 2/0.5 = 4 Omega`
Hence, the resistance of a conductor is 4 Ω.
APPEARS IN
संबंधित प्रश्न
If the potential difference across the ends of a conductor is 220 V and the resistance of the conductor is 44 Ω (ohm), then the current flowing through is _________.
- 0.2 A
- 0.5 A
- 2 A
- 5 A
Graph showing the variation of current versus voltage for a material Ga As is shown in the figure. Identify the region of
(i) negative resistance
(ii) where Ohm's law is obeyed.
Find the expression for the resistivity of a material and state the SI unit of resistivity.
Four resistances of 16 ohms each are connected in parallel. Four such combinations are connected in series. What is the total resistance?
In the circuit shown below in Fig, calculate the value of x if the equivalent resistance between A and B is 4 Ω.
Draw a neat diagram for the verification of Ohm’s law by voltmeter-ammeter method. By another diagram show the relation between p.d. and current.
The ratio of the potential difference to the current is known as ________.
State Ohm’s law? How can it be verified experimentally? Does it hold good under all conditions? Comment.
Two cells of same emf E but internal resistance r1 and r2 are connected in series to an external resistor R (Figure). What should be the value of R so that the potential difference across the terminals of the first cell becomes zero.
Why should an ammeter have low resistance?
