Would you please help me solve this problem? Muchappreciated. 1. This question i

Question

Would you please help me solve this problem? Muchappreciated.

1. This question is about electrical energy andassociated phenomena.Current electricity A

cell of electromotive force (e.m.f.) E and internalresistance r is connected in series with a

resistor R, as shown below.

The cell supplies 8.1 × 10 3 J of energy when 5.8 ×10 3 C of charge moves completely round the

circuit. The current in the circuit is constant.

(i) Calculate the e.m.f. E of the cell.

(ii) The resistor R has resistance 6.0 . The potentialdifference between its terminals is

1.2 V. Determine the internal resistance r of the cell.

(iii) Calculate the total energy transfer in the resistor R.

Explanation / Answer

   a.   EMF   E   =   Network done / net charge moved                            =   8.1* 103 / 5.8 * 103                            =   1.40   V                            =   1.40   V    b.   EMF, terminal potentialdifference (V = 1.2 V) and internal resistance are related as          E   =   V   +   I* r    also   V   =   I* R          I   =   1.2/ 6.0                =   0.2   A          =>   1.4   =   1.2   +   0.2* r    internalresistance   r   =   (1.4- 1.2) / 0.2                                           =   1.0       c.   Energy transferred toresistor      ER   =   V* q                                                                            =   1.2* 5.8 * 103                                                                            =   6.96* 103   J                                                                            =   6.96* 103   J

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