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Search Results for current - All Grades

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Grade 7 Magnetism and Electricity
Grade 9 Magnetism and Electricity
What type of current is commonly generated in U.S. power plants?
  1. Alternating Current
  2. Direct Current
  3. Magnetic Current
  4. All of the above
Grade 5 Atmosphere
Wind is                                                                          
  1. belts of moving air that flow from one area to another.
  2. caused by warm air rising and colder air moving in to take its place.
  3. a large mass of air that moves across the ocean's surface and across land.
  4. all of the above.
Grade 9 Oceanography and Hydrology
Grade 9 Oceanography and Hydrology
Grade 11 Magnetism and Electricity
Which of the following best describes electric current?
  1. the potential difference between electrons
  2. the flow of electrons around a nucleus
  3. the flow of electrons down a path
  4. the flow of electrons in a substance
Grade 9 Magnetism and Electricity
Complete the following statement:

If you increase the resistance in a series circuit,                               .
  1. the current will also increase
  2. the current will decrease
  3. the voltage will increase
  4. the voltage will decrease
Grade 9 Magnetism and Electricity
Grade 9 Magnetism and Electricity
Grade 9 Magnetism and Electricity
Brooke was watching T.V., charging her iPod, heating up her curling iron, and blow-drying her hair. When she plugged in her super-deluxe Austin Mahone singing make-up mirror with extra bright halogen bulbs the power went out and she caught a faint scent of burning rubber. What best explains what happened?
  1. Each device she added to the series circuit increased the total resistance. The voltage had to increase to provide current until it became so high it had to shut down.
  2. Every device she plugged in acted as a new resistor on a parallel circuit. This increased the resistance to the point that there was not enough voltage to power all the devices.
  3. Every device she plugged in acted as a new resistor on a parallel circuit. This would decrease the overall resistance on the parallel circuit and therefore increase the current flowing in the wires. Increasing the current generates more heat in the wire, causing a switch called a "circuit breaker" to open, stopping the flow of current in an attempt to prevent fire.
  4. Wizards obviously.
Grade 12 Magnetism and Electricity
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