Page+172++(no.+7-12,19)

7: This is because both are forms of energy. Part of the electric energy can be converted into heat energy. 8: The light is brighter because the current and the energy flowing through the wire increase, the heat energy released also increases. 9: Ampere and voltage have different meanings. Ampere is the unit of electric current while voltage is the potential energy per unit of charge at a particular location. 10: Current exists in circuit 5 to light a bulb. 11: The current is equal for both the battery and lightbulb. There are same amount of electrons in and out. 12: The rest are converted into heat energy. 19: C is the brightest and draws the most current, while A and B has the same brightness. If A is unscrewed, then B and C have the same brightness. If C is unscrewed, then A and B will be brighter.