By U.A.Bakshi, A.P.Godse
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Extra resources for Analog And Digital Electronics
For resistors greater than 2 watts, we have power resistors. Fortunately, they have their resistance values, power rating, and tolerance printed on them. ) See Figure 2-29. FIGURE 2-29 These resistors are wire-wound types at 5 Ω 5% 10 watts and 10 Ω 5% 10 watts. So how do we find out the power going into a device such as a resistor? From Ohm’s law, P = VI To determine the power absorbed or dissipated in a resistor we need to express P in terms of resistance. We also know that: I = V/R = (V/R) Let’s substitute this equation into the power equation so that: P = VI = P = V(V/R) = (VV/R)= (V)2/R Thus, P = (V)2/R P is measured in watts when the voltage V is measured in volts and the resistance R is NOTE measured in ohms.
I = V/R = (24 volts)/(24 ohms) = 1 amp Note that adding a 16-ohm resistor in series with an 8-ohm loudspeaker made the speaker’s current drop from 3 amps to 1 amp. Stated in another way, the 16 ohms of added resistance caused the current into the speaker to be reduced to one-third the original current. To bring the speaker’s current back up to the 3-amp level requires that the voltage source V increase threefold from 24 volts AC to 72 volts AC. For V = 72 volts, I = V/R = (72 volts)/(24 ohms) = 3 amps Therefore, raising the electrical pressure threefold in V restored the 3 amps of speaker current.
Capacitors Whereas resistors are measured in ohms, capacitors are measured by their capacitance in farads. However, a farad is a very large amount of capacitance, so most capacitors have values of microfarads or picofarads of capacitance. A microfarad (μF) is one-millionth of a farad. And a picofarad (pF) is one-millionth of a millionth of a farad or a millionth of a microfarad. Another commonly used term to denote capacitance is the nanofarad (nF), which is one-billionth of a farad. And just in case you are wondering, the farad is named after Michael Faraday.
Analog And Digital Electronics by U.A.Bakshi, A.P.Godse