# Glencoe Physical Science with Earth Science, Florida Edition

## Chapter 13: Electricity

### Math Practice

 1. A lightbulb is plugged in a 110-V wall outlet. How much electric power does the lightbulb use if the current in the bulb is 0.5 A? A) 66 W B) 62 W C) 50 W D) 55 W 2. A lightbulb is plugged in a 110-V wall outlet. How much electric power does the lightbulb use if the current in the bulb is 0.6 A? A) 66 W B) 62 W C) 55 W D) 72 W 3. A lightbulb is plugged in a 110-V wall outlet. How much electric power does the lightbulb use if the current in the bulb is 0.65 A? A) 71.5 W B) 62.3 W C) 55.5 W D) 74.3 W 4. A toaster is plugged in a 110-V wall outlet. How much electric power does the lightbulb use if the current in the bulb is 10.9 A? A) 1,000 W B) 1,300 W C) 1,199 W D) 1,500 W 5. What is the current in a toaster if the toaster uses 1,500 W of power when plugged into a 110-V wall outlet? A) 12.0 A B) 13.6 A C) 14.2 A D) 15.0 A 6. What is the current in a toaster if the toaster uses 2,000 W of power when plugged into a 110-V wall outlet? A) 17.0 W B) 16.5 A C) 19.2 A D) 18.2 A 7. What is the voltage in a dryer if the dryer uses 5,000 W of power when plugged into a 20.0-A wall outlet? A) 220 V B) 200 V C) 180 V D) 250 V 8. What is the voltage in a dryer if the dryer uses 4,200 W of power when plugged into a 22.0-A wall outlet? A) 186 V B) 180 V C) 200 V D) 191 V 9. What is the current in a dryer if the dryer uses 5,500 W of power when plugged into a 220-V wall outlet? A) 25 A B) 22 A C) 27 A D) 29 A 10. What is the current in a dryer if the dryer uses 5,940 W of power when plugged into a 220-V wall outlet? A) 22 A B) 27 A C) 29 A D) 32 A