Book 5A Units 3&4

This is a _______.

• light bulb

• switch

• wire

• battery

________ is a conductor.

• A plastic bottle

• An eraser

• A metal key

• Playdough

________ is an insulator.

• Copper wire

• Aluminium foil (鋁箔紙)

• Sea water

• A wooden stick

When the switch is closed, the light bulb _______ light up.

• will

• will not

When the switch is closed, the light bulb _______ light up.

• will

• will not

When the switch is closed, the light bulb _______ light up.

• will

• will not

When the switch is closed, the light bulb _______ light up.

• will

• will not

哪一種電器應用了電的光效應？

• 電暖爐

• 電燈

• 電風扇

• 電熱水壺

哪一項不是節約用電的方法？

• 選購能源效益高的電器

• 關掉不需要使用的電器

• 使用鎢絲燈泡代替慳電膽

• 開冷氣時關上窗戶

當繞着鐵器的電線通電時，會產生甚麼？

• 聲效應

• 光效應

• 熱效應

• 磁效應