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of 23 available terms

5 Matching Questions

1. Why does current stop almost instantly in a broken wire?
2. What are the two things that play into the brightness of a bulb?
3. Direct Current (DC)
4. Kirchoff's Voltage Law
5. What is the formula for power? What are the units?
1. a Because there is a build-up of positive charge the end of the broken wire, repelling the incoming current.
2. b Current and Voltage
3. c The flowing of charges (current) in one direction in a circuit.
4. d The total of all the potential differences around a closed path of a circuit must be equal to zero.
5. e Formula: Power=Work/Time or Power=Change in Energy/Time
Unit: Watt

5 Multiple Choice Questions

1. A switch that automatically interrupts or shuts off an electric circuit at the first indication of an overload of current.
2. The voltage is higher near the positive terminal, while it is lower near the negative terminal.
3. Definition: A mechanism that measures the current through a given portion of wire.
Units used: Amperes
4. Electric current that rapidly reverses in directions. The electric charges vibrate about relatively fixed positions.
5. Unbroken wire, broken wire.

5 True/False Questions

1. What is the formula for electrical power? What are the units?Formula: Power=Current*Voltage
Units: Watts

2. Kirchoff's Current LawThe total of all the potential differences around a closed path of a circuit must be equal to zero.

3. FuseDefinition: A measure of the amount of electrical charge transferred per a given unit of time.
Unit: Coulombs/Second=Amperes

4. Which charge does red wire represent? Black?From the positive terminal to the negative terminal; opposite the flow of electrons.

5. CapacitorAn electronic device that can maintain an electrical charge for a period of time and is used to smooth out the flow of electrical current--especially when there is a break in the current. Capacitors are often found in computer power supplies.