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"Electrical Power" Electric power PPT download (rated power and actual power in lesson 2)
Reaching standards and consolidating
1. Multiple choice questions
1. Regarding rated power and actual power, which of the following statements is correct ()
A. The rated power is related to the voltage when the electrical appliance is working
B. The rated power has nothing to do with the rated voltage of the electrical appliance.
C. The actual power is related to the voltage when the electrical appliance is working
D. The actual power has nothing to do with the voltage at which the electrical appliance is working.
2. When Xiaomeng was replacing the light bulb, he found that the light bulb was marked with "220 V | 40 W". Which of the following statements is correct ()
A. This bulb can only work at 220 V voltage
B. The actual power of the bulb is unchanged at 40 W
C. The light bulb consumes 40 W of electricity per second
D. The power of this light bulb when it is normally emitting light is 40 W.
3. The light bulb L is marked with "2.5 V 10 Ω". Which of the following statements is incorrect ()
A. The rated voltage of light bulb L is 2.5 V
B. The resistance of light bulb L is 10 Ω under any circumstances
C. The rated power of light bulb L is 0.625 W
D. The current of light bulb L during normal operation is 0.25 A.
4. When Xiao Lin was doing his homework, the light suddenly dimmed. The reason may be ()
A. The actual voltage of the electric lamp becomes larger
B. The rated voltage of the lamp becomes smaller
C. The actual power of the electric lamp becomes smaller
D. The rated power of the lamp becomes smaller
5. The two light bulbs A and B are marked with "220 V 25 W" and "220 V 100 W" respectively. The correct description of these two light bulbs is ()
A. The filament of lamp A is thick and has high resistance.
B. The filament of lamp A is thin and the resistance is high.
C. The filament of lamp B is thin and the resistance is small.
D. The filament of lamp B is thick and the resistance is high.
6. The voltage in household circuits sometimes drops to 198 V during peak power consumption periods. The actual power of a light bulb marked "220 V 100 W" when working at this voltage is (the filament resistance remains unchanged) ()
A.81 W B.100 W
C.119 W D.138 W
7. As shown in Figure 2-K-8, the power supply voltage is 6 V. When the small light bulb glows normally, the voltmeter indicates 2 V and the ammeter indicates 0.5 A. Then the rated power of the small light bulb is ( )
A.8 W B.4 W C.3 W D.2 W
8. The small light bulbs L1 and L2 are both marked with "6 V", and their filament resistances are represented by R1 and R2 respectively. The relationship between their current and voltage is shown in Figure 2-K-9, then ()
A.L1 is rated at 2.4 W
The resistance R2 of B.L2 is 12 Ω
C. If L1 and L2 are connected in parallel and work in a 4 V circuit, the actual power of the small bulb L2 is 1.2 W
D. When L1 and L2 are connected in series, if the current passing through is 0.2 A, the voltage across L1 and L2 is 4 V
2. Fill in the blanks
9. A small light bulb marked with "6 V 3 W". "6 V" means the ________ of the small light bulb, and "3 W" means the ________ of the small light bulb. During normal operation, the resistance of the small bulb is ________Ω, and the current through the small bulb is ________A. When the voltage across the small light bulb is 3 V, its actual power is ________W. (Assume the filament resistance remains unchanged)
10. The relationship between the current passing through a small light bulb marked "6 V 6 W" and the voltage at both ends changes as shown in Figure 2-K-10. If two such light bulbs are connected in series and connected to a 6 V power supply At both ends, the total power of the circuit is ________W.
11. There are currently two light bulbs L1 and L2, marked with "10 V | 10 W" and "9 V | 5.4 W" respectively. When they are used in series, the maximum voltage allowed to be applied to both ends of the circuit is ________V; the maximum power of the circuit is ________W. (Filament resistance remains unchanged)
12. Light bulbs L1 and L2 are marked with "4 V 4 W" and "3 V 3 W" respectively. If they are used in parallel, the maximum current allowed to pass through the main circuit is ________A. At this time, the electrical power of L1 is _ _______W. (Filament resistance remains unchanged)
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