Chapter 10, Problem 14RQ

Distinguish between the ac and dc.

To determine

The difference between the dc and ac.

Answer to Problem 14RQ

The direct current does not vary with time, while alternating current varies with time.

Explanation of Solution

The difference between the direct current and alternating current are following:

Sr.No.	Direct current (dc)	Alternating current (ac)
1.	The direction of the current does not vary with time.	The direction of current vary with time.
2.	The polarity of the electrical device remains same for the supply.	The polarity of the electrical device changes continuously.
3.	The current in the dc supply remain constant throughout at all the time.	The current in the ac supply vary between the maximum and minimum value of the supply.

Table (1)

Conclusion:

Therefore, the direct current does not vary with time, while alternating current varies with time.