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Electric Circuits
Fichas del conjunto (29)
- 1If a 60–watt bulb is used to light a room, how much current is flowing through the bulb given that the voltage is 120 volts? A. 180 amps B. 60 amps C. 2 amps D. 0.5 ampsD.
0.5 amps - 2If you have a light bulb connected to a circuit and you increase the current, what happens to the light bulb and the power (assuming the voltage remains the same)? A. The light bulb shines brighter and the power decreases. B. The light bulb shines brighter and the power increases. C. The light bulb gets dimmer and the power decreases. D. The light bulb gets dimmer and the power increases.B.
The light bulb shines brighter and the power increases. - 3Car headlights have both low beams and high beams. The high beams may be necessary when it is very dark outside. If the power for the high beam is 60.0 watts and the current is 5.0 amps, how much voltage is required? A. 65 volts B. 0.088 volts C. 12 volts D. 55 voltsC.
12 volts - 4What is the symbol for voltage? A. p B. V C. I D. vB.
V - 5What happens when like charges are brought together? A. They are attracted to each other. B. They repel each other. C. They neutralize each other. D. They form one larger charge.B.
They repel each other. - 6What is the function of the commutator in a DC motor? A. to spin the magnet B. to change direct current into alternating current C. to change alternating current into direct current D. to spin the wire coilB.
to change direct current into alternating current - 7A flashlight uses four batteries to power it. Which type of current flows inside the flashlight? A. direct B. alternating C. repeating D. pulsatingA.
direct - 8What type of electric current does a power plant generate for use in your home? A. direct B. alternating C. repeating D. straightA.
direct - 9What does AC stand for in physics? A. alternating current B. alternative circuit C. alternating composition D. all chargeA.
alternating current - 10Which choice defines AC and DC correctly? A. In AC, electrons moving in one direction. In DC, they move in one direction and then in the other direction. B. In DC, electrons move in only one direction. In AC, electrons move in one direction and then in the other direction. C. In AC and DC, electrons move in the same direction. D. In AC and DC, electrons move in opposite directions.B.
In DC, electrons move in only one direction. In AC, electrons move in one direction and then in the other direction. - 11Why is alternating current more effective at long–distance travel than direct current? A. The power lines are made out of conductors. B. Transformers increase or decrease voltage as needed. C. The AC generator is more efficient. D. AC has lower voltage than DC.B.
Transformers increase or decrease voltage as needed. - 12Which type of motor uses a brush and commutator to operate? A. AC motor B. split ring motor C. DC motor D. brush motorC.
DC motor - 13A flashlight uses four batteries to power it. Which type of current flows inside the flashlight? A. direct B. alternating C. repeating D. pulsatingA.
direct - 14Which type of current is produced by a wire breaking magnetic field lines and changing the polarity? A. alternating B. direct C. straight D. alternating and directA.
alternating - 15A 12–volt car battery pushes a charge through the headlight circuit with a resistance of 8.5 ohms. How much current is passing through the circuit? A. 670 amps B. 0.71 amps C. 102 amps D. 1.4 ampsD.
1.4 amps - 16An alarm clock has a current of 4.5 amps and a resistance of 3.2 ohms. What is the voltage in the circuit? A. 1.4 volts B. 0.71 volts C. 14 volts D. 46 voltsC.
14 volts - 17What is the measure of how difficult it is for current to flow in a circuit? A. voltage B. resistance C. power D. energyB.
resistance - 18How many ohms of resistance must be present in a circuit that has 240 volts and a current of 15 amps? A. 3,600 ohms B. 16 ohms C. 230 ohms D. 0.063 ohmsB.
16 ohms - 19What is the voltage of a circuit in a toaster with 12.0 amps of current and 8.0 ohms of resistance? A. 96 volts B. 1.5 volts C. 0.67 volts D. 20 voltsA.
96 volts - 20Which of these circuit schematics has an ammeter? A. A B. B C. C D. DD. D
- 21Which of these components is present in this circuit schematic? A. switch B. AC power C. capacitor D. resistorD.
resistor
- 22What is the voltage measured with a voltmeter across a wire in a circuit? A. The voltage is the same as the voltage across the power source. B. The voltage is half of the voltage of the power source. C. The voltage is zero. D. A voltmeter cannot measure the voltage across a wire.C.
The voltage is zero. - 23Look at the symbol. Which component in a circuit does it represent? A. conductor B. AC power source C. DC power source D. switchC.
DC power source
- 24Look at the symbol. Which component in a circuit does it represent? A. resistor B. switch C. AC power source D. DC power sourceA.
resistor
- 25What is the current in a parallel circuit which has two resistors (17.2 ohms and 22.4 ohms) and a power source of 6.0 volts? A. 0.30 amps B. 9.8 amps C. 0.61 amps D. 1.2 ampsC.
0.61 amps - 26What type of circuit has all its resistors in the same path? A. series B. parallel C. combined D. alignedA.
series - 27In what type of circuit will the equivalent resistance be less than the resistors in the circuit? A. series B. aligned C. straight D. parallelD.
parallel - 28A combined circuit has two resistors in parallel (10.0 ohms and 14.0 ohms) and another in series (5.0 ohms). If the power source is 9.0 volts, what is the current? A. 1.6 amps B. 5.8 amps C. 0.83 amps D. 1.3 ampsC.
0.83 amps - 29The image below is a schematic of what type of circuit? A. series B. aligned C. parallel D. boxedC.
parallel
Información
- Descripción
- - Electric Current - AC and DC Currents - Resistance and Ohm's Law - Circuit Diagrams - Series and Parallel Circuits
- Creado por
- Elexali Olayvar
- Visitas
- 1
- Valoración