15
 EXAMPLE 7 7
Rationalised 2023-24
193
Alternating Current
 EXAMPLE 7 9
Since f is negative, the current in the circuit lags the voltage
across the source (c) The power dissipated in the circuit is
2
P
I R
=
Now, I
=im
=


 =
2
1
2
283
5
40A
Therefore, 
A
W
(40 )2
3
4800
P =
×
Ω =
(d) Power factor =
�
�
cos
cos –53