23. How can we Identify if a material is a good conductor of heat and electricity?
B. If heat and electricity cannot pass through easily.
C. If heat and electricity can pass through easily.
D. If a material is made up of wood,
E. If a material is made up of plastic,
24. Which of these materials DO NOT allow electricity to pass through?
B. gold
B. rubber
C. bronze
D. copper wire​