Advertisements
Advertisements
Question
State Ohm's law.
Solution
Ohm's law states that the electric current flowing through a metallic wire is directly proportional to the potential difference V across its ends provided its temperature remains the same.
APPEARS IN
RELATED QUESTIONS
Write symbol and state function of following component in an electric circuit :
voltmeter
The unit of current is :
A bulb draws current 1.5 A at 6.0 V. Find the resistance of filament of bulb while glowing.
State and define the SI unit of electric current.
State the relation between electric current; the number of electrons moving in a circuit and time in seconds.
A charge of 8860 C flows through an electric circuit in 2 min and 40 s. Calculate the magnitude of current in a circuit.
The following figure shows a metal rod PQ mounted on an insulated stand. The cap of an uncharged electroscope touches one end Q of the metal rod. A negatively charged ebonite rod is brought near the other end P of the metal rod.
(a) What charge does the end P have?
(b) What charge does the end Q have?
(c) What charge does the cap of the electroscope have?
(d) What charge does the gold leaf have?
(e) Will the leaf diverge or collapse? Give reason.
(f) If the electroscope is now earthed, what charge does the metal rod have?
