Electrical Energy

A student is pulling clothes from the dryer and finds a shirt and a towel clinging to each other. What is the most likely explanation for why the shirt is clinging to the towel?

• The shirt and the towel have opposite charges.

• The shirt and the towel have changing charges.

• Both the shirt and the towel have a neutral charge.

• Both the shirt and the towel have a positive charge.

Brett blows up a balloon and rubs it in his hair to give it a negative charge. Then he moves the same balloon near a pile of small pieces of cut-up paper. The paper pieces move toward the balloon. Why did the paper pieces move toward the balloon? SC.5.P.10.3

• Objects with opposite charges repel each other.
• Objects with the same charge attract each other.
• A charged object can attract an uncharged object.
• A charged object transfers its charge to uncharged objects.

Which condition must be met for electricity to flow in a basic electrical circuit?

• A light bulb must be present in the circuit.

• The switch must be closed to complete the circuit.

• The circuit can function without a power source.

• The circuit can have gaps and still work.

The diagram shows a circuit with a battery, a light bulb, and several connection points labeled W, X, Y, and Z. To complete the circuit and light the bulb, where should the wire be connected?

• point W

• point X

• point Y

• point Z

Which of the following materials is the best conductor of electricity?

• plastic spoon

• rubber band

• copper wire

• paper sheet

Which of the following materials is known to be a poor conductor of electricity?

• aluminum

• iron

• rubber

• silver