← Electricity Test
5 Written Questions
5 Matching Questions
- Why does current stop almost instantly in a broken wire?
- What are the two things that play into the brightness of a bulb?
- Direct Current (DC)
- Kirchoff's Voltage Law
- What is the formula for power? What are the units?
- a Because there is a build-up of positive charge the end of the broken wire, repelling the incoming current.
- b Current and Voltage
- c The flowing of charges (current) in one direction in a circuit.
- d The total of all the potential differences around a closed path of a circuit must be equal to zero.
- e Formula: Power=Work/Time or Power=Change in Energy/Time
5 Multiple Choice Questions
- A switch that automatically interrupts or shuts off an electric circuit at the first indication of an overload of current.
- The voltage is higher near the positive terminal, while it is lower near the negative terminal.
- Definition: A mechanism that measures the current through a given portion of wire.
Units used: Amperes
- Electric current that rapidly reverses in directions. The electric charges vibrate about relatively fixed positions.
- Unbroken wire, broken wire.
5 True/False Questions
What is the formula for electrical power? What are the units? → Formula: Power=Current*Voltage
Kirchoff's Current Law → The total of all the potential differences around a closed path of a circuit must be equal to zero.
Fuse → Definition: A measure of the amount of electrical charge transferred per a given unit of time.
Which charge does red wire represent? Black? → From the positive terminal to the negative terminal; opposite the flow of electrons.
Capacitor → An 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.