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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

Q 14. 30 bulbs are connected in series. If one bulb is fused and remaining 29 bulbs are joined in series and connected to the same supply, the light in the room will be:(increased, decreased, remained same)

Solve this :Q. What is difference between fuse wire and heating wire