UCE PHYSICS 2011 PAPER 2 QTN 7

. (a) (i) What is meant by electromotive force.

 

(ii) A dry cell supplies a current of 1.2A through two 2Ω resistors connected in parallel. When the resistors are connected in series, the current flowing in the circuit is 0.4A.

 

Find the electromotive force.

 

(b) An electric lamp is rated 12V, 24W.

 

(i) Explain what is meant by this statement.

 

(ii) How much current does the lamp draw when connected across a 12V supply?

 

(c ) with the aid of a labelled diagram, describe how four semi -conductor diodes may be used for full wave rectification.

 

Leave a comment

Your email address will not be published.