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DedPeter [7]
3 years ago
13

When it is necessary to switch on an electrical current from a remote location, which devices could be used?

Physics
2 answers:
wolverine [178]3 years ago
4 0
A classic example is a remote control. The mechanical force exerted by pressing the switches produces electric current (often times creating the electrical continuity of contacts when switch is pressed) within the remote control device allowing it to send radio signals to the receiver.
katen-ka-za [31]3 years ago
4 0

Answer: Remote control.

Explanation: The most classical example of a device that is used with this objective is the remote control (or clicker).

While the first remote controls used ultrasonic pulses, nowadays they use infrared radiation (there are other types, but this is the most common one), this is what allows them to work from distance. There are "codes" in the radiation that are read by a "camera" and are interpreted for things like turn on the power (and other things, maybe control a drone, change the channel, etc).

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4 years ago
How to solve 30(a)<br><br> Give solution asap.
expeople1 [14]

Answer:

They will not meet

h-hX=1.2*g*t²

hX=v0*t-(1/2*g*t²)

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elevation time if v0=20 m/s  te=v0/g=20 m/s /9.81 m/s²=2.0387s

hmax=v0²/(2*g)=(400 m²/s²)/19.62 m/s²2=20.387 m

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3 years ago
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How much work will be done by electric energy source with a P.d of 4KV that delivers a current of 1 A for 1 minute?
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Answer:

Given that battery V = 12.0 V

Resistance R = 2.0 ohms

a ) current in the battery is I = V /R

                                                = 12.0 V / 2.0

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b ) charge transported in the circuit is   q = i * t  

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c ) Work done on the charge by the electric field is 0 ( there is no internal resistance )

d ) work done through the resistor is w = P * t

                                                            = ( V)^2 / R * t

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f ) there is no internal resistance hence  E = 0

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