Advertisements
Advertisements
Question
Define the following:
Super conductors
Advertisements
Solution
Substances whose resistance decreases tremendously with decreasing temperature and reaches nearly zero near absolute zero are called superconductors; e.g., lead, tin, etc.
APPEARS IN
RELATED QUESTIONS
One coulomb of charge flows through any cross-section of a conductor in 1 second. What is the current flowing through the conductor?
A battery of e.m.f. 15 V and internal resistance 3 ohm is connected to two resistors of resistance 3 ohm and 6 ohm in series. Find:
(i) The current through the battery,
(ii) The p.d. between the terminals of the battery.
An electric bulb is rated at 220 V, 100 W.
- What is its resistance?
- What safe current can be passed through it?
Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. The resistance of each heater
An electric bulb is marked 100 W, 250 V. How much current will the bulb draw if connected to a 250 V supply?
Name any two devices, which are working on the heating effect of the electric current.
When an electric current is passed, electrons move from:
Assertion (A): Electric current will not flow between two charged bodies when connected if their charges are the same.
Reason (R): Current is the rate of flow of charge.
