Electricity Tes...

A copper $$(\rho =1.6\times 10^{-8}\Omega m)$$ wire and an Aluminium $$(\rho =2.5\times 10^{-8}\Omega m)$$ wire have equal cross sectional area and equal resistances. The ratio of their lengths is

The equivalent conductance of two wires of resistance 10 ohm and 5 ohm joined together in parallel is:

The current that passes through 20 ohm resistance when it is connected in parallel with a 30 ohm resistance and this set is connected to a battery of 2V is

The resistance between A and B is:

There are $$5$$ tube-lights each of $$40\ W$$ in a house. These are used on an average for $$5\ hrs/day$$. In addition, there is an immersion heater of $$1500\ W$$ used on an average for $$1\ hr/day$$. The number of units of electricity that are consumed in a month of $$30\ days$$ is:

If an electric iron of $$1200 \ W$$ is used for $$30 \ minutes$$ everyday, find electric energy consumed in the month of April.

The resultant resistance of two resistors when connected in series is 48 ohm. The ratio of their resistances is 3 : 1. The value of each resistance is

If the electric current in a lamp decreases by $$5\ \%$$, then the power output decreases by:

Three unequal resistors in parallel are equivalent to a resistance $$1\ \Omega$$. If two of them are in the ratio $$1 : 2$$ and if no resistance value is fractional, the largest of the three resistances in $$\Omega$$ is:

The electrical energy in kilowatt hours consumed in operating ten $$50\ W$$ bulbs for $$10\ hrs/day$$ in a month of $$30\ days$$ is