Electricity Tes...

You are given several identical resistance each of value $$R=10$$ and each capable of carrying a maximum current of one ampere. It is required to make a suitable combination of these resistance of $$5$$ which can carry a current of $$4$$ ampere. The minimum number of resistance's of the type $$R$$ that will be required for this job is

A $$30\ V,\ 90\ W$$ lamp is to be operated on a $$120\ V\ DC$$ line. For proper glow, a resistor of ..... should be connected in series with the lamp. 

$$1 Wh$$ (Watt hour) is equal to :

Which of the following shows energy changes that takes place when an incandescent bulb glows using a battery?

A 30V-90W lamp is operated on a 120 V DC line. A resistor is connected in series with the lamp in order to glow it properly. The value of resistance is

Two resistors $$400\ \Omega $$ and $$800\ \Omega$$ are connected in series with a 6 V battery. the potential difference measured by voltmeter across $$400\ \Omega $$ resistor is:

In the following circuit, the 1 $$\Omega$$ resistor dissipates power P. If the resistor is replaced by 9 $$\Omega$$, the power dissipated in it is

Which of the following are the properties of fuse wire? 

The ratio of resistance of two copper wire of the same length and of same cross-sectional area, when connected in series to that when connected in parallel, is

An electric circuit contains an operating heating element and a lit lamp. Which statement best explains why the lamp remains lit when the heating element is removed from the circuit?