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Write symbol and state function of following component in an electric circuit :
ammeter
A cell is used to :
The unit of current is :
On increasing the resistance in a circuit, the current in it :
A current 0.2 A flows in a wire of resistance 15Ω. Find the potential difference across the ends of the wire.
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?
What is the SI unit of resistance?
