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In superconductors , for example mercury at 4.2K , the resistance becomes zero allowing charges to flow through it without any loss in energy .
WKT , I=V/R as per ohms law,
When R=0 , I=V/0=infinity .
How can current flow through it , how can we supply infinity current , HOW ?
Four cells of emf 'E' are joined in parallel to form a battery. The equivalent emf of battery will be _________
If four 100 W devices are used daily for 2 hours, what will be the electricity bill for 30 days The cost for one unit is 1 rupee.
a wire carrying current I and other carrying current 2I in the same direction produce a magnetic field B at the mid point.What will be the field when 2I wire is switched off?
the main source of biomass is
ohm's law is
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Syllabus
i)current / potential difference = constant ii) potential difference / current = constant iii) current = resistance x potential difference
In superconductors , for example mercury at 4.2K , the resistance becomes zero allowing charges to flow through it without any loss in energy .
WKT , I=V/R as per ohms law,
When R=0 , I=V/0=infinity .
How can current flow through it , how can we supply infinity current , HOW ?
Four cells of emf 'E' are joined in parallel to form a battery. The equivalent emf of battery will be _________
IF VEENA'S CAR RADIOWILL RUN FROM A 12V CAR BATTERY THAT PRODUCES A CURRENT OF0.2A EVEN WHEN THE ENGINE IS TURNED OFF.THE CAR BATTERY WILL NO LONGER OPERATE WHEN IT HAS LOST 1.2*10 TO THE POWER 6 JOULE OF ENERGY. IF VEENA GETS OUT THE CAR LEAVING THE RADIO ON HOW LONG WILL IT TAKE FOR THE BATTERY TO GO COMPLETELY DEAD,THAT IS LOSE ALL ENERGY[1DAY=86400SEC]
If four 100 W devices are used daily for 2 hours, what will be the electricity bill for 30 days The cost for one unit is 1 rupee.
a wire carrying current I and other carrying current 2I in the same direction produce a magnetic field B at the mid point.What will be the field when 2I wire is switched off?
the main source of biomass is
ohm's law is
Q.22) A generator has an e.m.f. of 440 Volt and internal resistance of 400 Ohm. Its terminals are connected to a load of 4000 Ohm the voltage across the load is
(a) 220 volt
(b) 440 volt
(c) 200 volt
(d) 400 volt
Hint:W=Q/I
Five resistors of resistance 'R' are connected such that they form a letter 'A'.Find the effective resistance across the free ends
(increased, decreased, remained same)
Q. What is difference between fuse wire and heating wire