9What will happen to two bulbs if you add batteries in a circuit?

A. The bulb will not light

B. The bulb will explode

C. The bulb will light even brighter

D. The bulb will light brighter but may be busted afterwards

_____10. What happens when one bulb is busted in a set of Christmas

lights and the other bulbs will not light up?

A. Electricity is turned off

B. Some bulbs are defective

C. The bulbs are connected in a parallel circuit

D. The bulbs are connected in a series circuit​