Simple Circuits

Grade 4 Science Worksheet

Circle the answer.

1. 1.

   A student says, "The battery makes the bulb light, so the wire back to the battery is not needed." Why is this wrong?

   • current needs a complete loop back to the battery
   • the battery only works when it is warm
   • the extra wire makes the bulb brighter
   • the bulb needs two batteries to light
2. 2.

   A loop with a battery, a closed switch and a bulb works. Ty adds a buzzer into the same loop. Now nothing works. What is most likely?

   • the bulb now blocks all sound energy
   • the switch opened when the buzzer was added
   • the buzzer is broken and leaves a gap in the loop
   • the battery got stronger with the buzzer
3. 3.

   What does a buzzer change electrical energy into?

   • cold
   • light
   • motion
   • sound
4. 4.

   A toaster changes electrical energy into which kind of energy?

   • motion
   • heat
   • cold
   • sound
5. 5.

   A hair dryer blows warm air. What does it change electrical energy into?

   • heat and motion
   • light and sound only
   • heat only
   • motion only