In the novel, he purposely increased the voltage, which was designed to give the girl enough shock for her to burn up. He had already experimented it on cats and wanted to see it happening to a child like her. He wasn't sure if it was enough to kill her, though. That was why he brought the detested classmate along. He wanted him to get the blame if she did die. He was disappointed the girl had only passed out so he left it to the boy to take her back to the nurse's office. But alas, the classmate took the matter into his own hands without the boy's knowledge.
The boy was angry with the classmate because he "stole" his right to decide what to do with her (suggesting that he had planned to increase the voltage even more and test it on her again later). Hence, the boy's violent confrontation with the classmate later on. The film's scene wasn't as clear as the novel's scene.
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