Chapter 25: Problem 8
When a large electric load such as a washing machine or oven comes on, lights throughout a house often dim. Why?
Chapter 25: Problem 8
When a large electric load such as a washing machine or oven comes on, lights throughout a house often dim. Why?
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Get started for freeYou company is designing a battery-based backup power source, In and your job is to assess its safety. You know that under damp or sweaty conditions, the resistance between two points of unbroken skin on the human body can be as low as \(500 \Omega\). Your product uses a \(72-\mathrm{V}\) battery whose internal resistance is \(100 \Omega .\) Is it capable of passing a fatal 100 mA (Table 24.3 ) through a damp human body?
You're writing the instruction manual for a stereo amplifier with a maximum output of 100 W. The amplifier can be modeled as an emf in series with an \(8-\Omega\) resistance. What should you specify for the loudspeaker resistance to be used with the amplifier? How much power can the amplifier deliver to a speaker with half the optimum resistance?
If capacitance is in \(\mu \mathrm{F}\), what will be the units of the time constant \(R C\) when resistance is in (a) \(\Omega,\) (b) \(\mathrm{k} \Omega,\) and \((\mathrm{c})\) M\Omega? (Your answers eliminate the need for tedious power- of-10 conversions.)
Are household electrical outlets connected in series or parallel? How do you know?
A capacitor used to provide steady voltages in the power supply of a stereo amplifier charges rapidly to \(35 \mathrm{V}\) every \(1 / 60\) second. It must then hold that voltage to within \(1.0 \mathrm{V}\) for the next \(1 / 60 \mathrm{s}\) while it discharges through the amplifier. If the amplifier draws 1.2 A from the \(35-\mathrm{V}\) supply, (a) what's its effective resistance, and (b) what capacitance is needed?
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