";s:4:"text";s:4593:"This is also called as line channel. (Recall that ohmic devices follow Ohm’s law \(V = IR\).) The CFL bulb is also less durable than the LED bulb because of its glass construction. A fuse is basically a short piece of wire between two contacts. (b) broadcasting (c) attenuated (d) interferred with, (a) multiplexing (b) telemetry For example, CFL bulbs contain mercury, a neurotoxin, and must be disposed of as hazardous waste. ■ That the function of information source is to produce required message which has to be transmitted. Demodulation is the reverse process of modulation carried out in transmitter. (a) 10 kHz (c) 5 kHz
As mentioned above, the cost of the bulbs and the life span of the bulbs are important considerations. ■ A telephone network makes use of a switching mechanism.
Since power is energy per unit of time, in theory it can be calculated after measuring the energy used per second. To calculate electric power, consider a voltage difference existing across a material (Figure \(\PageIndex{2}\)). Each time the wrench is pushed with a certain force over a certain distance, work is performed. QUESTIONS.
The CFL bulbs use a “ballast” that increases the voltage used by the CFL bulb. The demand on the power plant can lead to increased greenhouse gases, particularly if the power plant uses coal or gas as fuel. The fuse is destroyed and must be replaced, but it protects the rest of the circuit. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. is the energy used by a device using power P for a time interval t. If power is delivered at a constant rate, then then the energy can be found by \(E = Pt\). Example \(\PageIndex{2\): Calculating the Cost Effectiveness of LED Bulb. Examples of point-to-point channels are wirelines, About 20% of a home’s use of energy goes to lighting, and the number for commercial establishments is closer to 40%.
An everyday example of energy and power involves automobiles. Electric motors have a reasonably high efficiency. The excited gas molecules produce ultraviolet (UV) light, which in turn stimulates the fluorescent coating on the inside of the tube. The energy unit on electric bills is the kilowatt-hour \((kW \cdot h)\), consistent with the relationship \(E = Pt\). This heat adds to the heat of the environment and adds to the demand on power plants providing the power.
\[cost_{Incandescent} = 109.5 \, kW \cdot h \left(\dfrac{\$0.10}{kW \cdot h}\right) = \$10.95\] \[cost_{LED} = 21.90 \, kW \cdot h \left(\dfrac{\$0.10}{kW \cdot h}\right) = \$2.19\]. ■ Several sources of information which are responsible for the generation of message signals. The 60-W bulb glows brighter than the 25-W bulb. ■ Following are the advantages of digital communication: Page No.
Explain the fundamental limitations of a communication system. This force does not act to accelerate the charge through the entire distance \(\Delta L\) because of the interactions of the charge with atoms and free electrons in the material. This property is of its most importance in military applications. If an electric motor is turning the bolt, then the total flow of electricity can be measured in kilowatt-hours, and this equals the energy.
16. Fluorescent lights are about four times more efficient than incandescent lights—this is true for both the long tubes and the compact fluorescent lights (CFLs), e.g., Figure \(\PageIndex{1b}\).
The kinetic energy lost by the electrons in collisions is converted into the internal energy of the conductor and radiation. (Note that the LED bulbs are coming down in price.) (c) Assuming that the difference in the power consumed by the motor and the power used lifting the object are dissipated as heat by the resistance of the motor, estimate the resistance of the motor?