Physics

1Two 4 Ω resistors in series are connected to a 12 V battery. The current is

2A fuse should be connected in the

3A transformer has 100 turns on its primary and 500 turns on its secondary. If the primary voltage is 240 V, find the secondary voltage.

4The power of a lamp drawing 0.5 A from a 240 V supply is

5Which material is used for the core of an electromagnet?

6The power dissipated in a 4 Ω resistor carrying 3 A is

7An electric iron of 1,000 W on 250 V draws a current of

8A cell of e.m.f. 3 V and internal resistance 1 Ω drives current through a 5 Ω resistor. The terminal p.d. is

9Which of the following materials is ferromagnetic?

10Soft iron is used for electromagnet cores because it