19. Which energy transformation occurs in an electric iron?
A. Heat to Light
C. Heat to Electricity
B. Light to Heat
D. Electricity to Heat

20. Rubbing two pieces of wood together can produce heat and later turn into another form of energy.
A. Sound Energy
C. Light Energy
B. Heat Energy
D. Electrical Energy

21. Many appliances you use every day change electrical energy into other forms. When you use a toaster to toast bread, electrical energy is changed to and
A Heat and Sound
C. Heat and Light
B. Light and Sound
D. Heat and Nuclear

22. When you lighted a lamp or candle, the chemical energy of the lamp is changed into li
energy, and at the same time it can produce
D. Chemical
C. Electricity
B Sound
A. Heat​