(a) Find the voltage drop in an extension cord having a $0.0600-\Omega$ resistance and through which 5.00 A is flowing. (b) A cheaper cord utilizes thinner wire and has a resistance of $0.300\ \Omega.$ What is the voltage drop in it when 5.00 A flows? (c) Why is the voltage to whatever appliance is being used reduced by this amount? What is the effect on the appliance?

(a) Find the voltage near a 10.0 cm diameter metal sphere that has 8.00 C of excess positive charge on it (b) What is unreasonable about this result? (c) Which assumptions are responsible?

Electron guns are used in X-ray tubes. The electrons are accelerated through a relatively large voltage and directed onto a metal target, producing X-rays. (a) How many electrons per second strike the target if the current is 0.500 mA? (b) What charge strikes the target in 0.750 s?

A heart defibrillator passes 10.0 A through a patient’s torso for 5.00 ms in an attempt to restore normal beating. (a) How much charge passed? (b) What voltage was applied if 500 J of energy was dissipated? (c) What was the path’s resistance? (d) Find the temperature increase caused in the 8.00 kg of affected tissue.

A North American tourist takes his 25.0-W, 120-V AC razor to Europe, finds a special adapter, and plugs it into 240 V AC. Assuming constant resistance, what power does the razor consume as it is ruined?

How many volts are supplied to operate an indicator light on a DVD player that has a resistance of $140 \Omega$, given that $25.0 \mathrm{~mA}$ passes through it?

How many volts are supplied to operate an indicator light on a DVD player that has a resistance of $140 \Omega,$ given that 25.0 mA passes through it?

How many volts are supplied to operate an indicator light on a DVD player that has a resistance of 140 $\Omega$ , given that 25.0 mA passes through it?

A clock battery wears out after moving 10,000 C of charge through the clock at a rate of 0.500 mA. (a) How long did the clock run? (b) How many electrons per second flowed?

A small office-building air conditioner operates on 408-V AC and consumes 50.0 kW. (a) What is its effective resistance? (b) What is the cost of running the air conditioner during a hot summer month when it is on 8.00 h per day for 30 days and electricity costs $9.00\ \mathrm{cents/kW} \cdot \mathrm{h} ?$

What current flows through a 2.54-cm-diameter rod of pure silicon that is 20.0 cm long, when 1.00 $\times$ 10$^3$ V is applied to it? (Such a rod may be used to make nuclearparticle detectors, for example.)

Calculate the ionization constant for each of the following acids or bases from the ionization constant of its conjugate base or conjugate acid: (a) $\mathrm{F}^{-}$ (b) $\mathrm{NH}_{4}^{+}$ (c) $\mathrm{AsO}_{4}^{3-}$ (d) $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}_{2}^{+}$ (e) $\mathrm{NO}_{2}^{−}$ (f) $\mathrm{HC}_{2} \mathrm{O}_{4}^{-}$ (as a base)

Circumduction is a combination of four movements. List these four movements, and describe each.

Some electric stoves have a flat ceramic surface with heating elements hidden beneath. A pot placed over a heating element will be heated, while it is safe to touch the surface only a few centimeters away. Why is ceramic, with a conductivity less than that of a metal but greater than that of a good insulator, an ideal choice for the stove top?