The Crucible shows that conflict is often a struggle between the powerful and the powerless. Give examples.
I would modify this. This play shows that conflict is a struggle between those who have officially sanctioned power and those who lack it, some of whom are willing to use other methods to gain power. The best example of this is the girls who take part in the "witchcraft." They are young and female in a time and place where power belonged to the older males. If they went through official channels—direct appeal, community action, the church—they would have little power and effect. By shifting the field of conflict to one where their claims could not be answered, they shifted the battle, so that it became between several different types of power. Abigail's sexual allure is another example. As a young woman she lacks formal power, so she uses John's attraction towards her.