electricity

Unit of electric current is

S.I. unit of power is

1 kW h = _____ joules

• $3.6\times10^{6\ }$

• $6.022\times10^6$

• $7.2\times10^6$

Which of the following formulae is/are correct ?

•  $I=\frac{V}{R}$  

•  $\rho=\frac{RA}{l}$  

•  $H=I^2RT$  

•  $P=VI$  

•  $V=\frac{Q}{W}$  

Guess the symbol.

• Ammeter

• Voltmeter

• Rheostat

• Resistor

The SI unit of resistance is :

• ohm

• Newton

• Watt

• Joule

A car headlight bulb working on a 12 V car battery draws a current of 0.5 A. The resistance of the light bulb is:

• 0.5 Ω

• 6 Ω

• 12 Ω

• 24 Ω

The resistance whose V-I graph is given is

• $\frac{5}{3}\Omega$

• $\frac{3}{5}\Omega$

• $\frac{5}{9}\Omega$

• $\frac{2}{5}\Omega$

Two resistors are connected in series gives an equivalent resistance of 10 Ω. When connected in parallel, gives 2.4 Ω. Then the individual resistance are

• each of 5 Ω

• 6 Ω and 5 Ω

• 6 Ω and 4 Ω

• 7 Ω and 4 Ω