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☆☆☆☆☆Cards in this guide (14)
What unit is used to measure resistance
ohm
The process of creating electricity in one place and moving it to another for use
transmitting
A string of 15 Christmas tree lights is connected in series to a 90 volt power source What is the value of the resistance of each light if the current flowing through the circuit is 2 amps
3
3 ohms
A ray of light strikes a flat surface of water The angle that the incoming light ray makes with the normal is called the angle of
incident
The apparent change in the frequency of a sound emitted by a moving object as it passes a stationary observer is called the what effect
Doppler effect.
A string of 20 Christmas tree lights are connected in series to a 20 volt power source The bulbs each have a resistance of .5 ohm How much current is flowing through the circuit
2 amps. If it is D.C.
Five resistors are connected together in series One resistor is 2 ohms one is 3 ohms one is 4 ohms one is 5 ohms and the fifth is 6 ohms What is the total resistance
Purely additive. 2+3+4+5+6=20.
A 120 ohm resistor a 60 ohm resistor and a 40 ohm resistor are connected in parallel to a 120 volt power source What is the effective resistance of the three resistors
Reff = R1*R2 / (R1+R2)
if you follow this for all three, you will end up with 20 ohms.
Light wave is composed of two components an electrical component and a component
magnetic
After an approaching ambulance passes a stationary observer what does the frequency of the sound of the siren heard by the observer appear to do
It decreases.
This is not just apparent. The frequency emitted by the siren is constant, but the frequency arriving at the observer really does change.
A pulley system is used to lift a 2000 newton engine up a distance of 3 meters The operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor To lift the engine fi
250 newtons
A+ Answers
The speed of sound in water is 1430 meters per second Find the wavelength of a sound with a frequency of 286 Hz traveling through the water
5 meters
What is the speed of a sound wave that has a wavelenght of 102 meters and a frequency of 250hz
speed = wavelength * frequency wavelength = 102 meters
frequency = 250 Hz = 250 cycles/second
102 * 250 = 25500 meters/second
What is the total current flowing through a 45 ohm resistor 1.4 amps and 20 ohm resistor 1.8 amps
Just add the amps (3.2 amps).
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