-Explain Ohm's Law and give several mathematical examples.26Calculate the current where 10 coulombs of charge pass a point in 5 seconds.27Calculate the current of a lightning bolt that delivers a charge of 35 coulombs to the ground in a time of 1/1000 second.28Calculate the current in a toaster that has a heating element of 14 ohms when connected to a 120-V outlet.29.Calculate the current in the coiled heating element of a 240-V stoveThe resistance of the element is 60 ohms at its operating temperature.30Electric socks, popular in cold weather, have a 90-ohm heating element that is powered by a 9-volt batteryHow much current warms your feet?31How much current moves through the fingers (resistance: 1200 ohms) if you touch them to the terminals of a 6-volt battery?32Calculate the resistance of a filament in a light-bulb that carries 0.4A when 3.0 V is impressed across it.33Calculate the current in a 140-W electric blanket connected to a 120-V outlet.
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There are three basic mechanisms for heat transfer: conduction, convection, and radiationAir is a worse thermal conductor than styrofoam, but convection dominates if it is allowed to flow (hot air rises, for example)Porous solids such as stryofoam are more effective than air alone because they entrain the air, preventing convective heat transfer.
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26Calculate the current where 10 coulombs of charge pass a point in 5 secondscurrent 10/5 2 amps 27Calculate the current of a lightning bolt that delivers a charge of 35 coulombs to the ground in a time of 1/1000 second35/1ms 35000 amps 28Calculate the current in a toaster that has a heating element of 14 ohms when connected to a 120-V outletI 120/14 29.Calculate the current in the coiled heating element of a 240-V stoveThe resistance of the element is 60 ohms at its operating temperatureI 240/60 4 amps 30Electric socks, popular in cold weather, have a 90-ohm heating element that is powered by a 9-volt batteryHow much current warms your feet? I 9/90 100mA 31How much current moves through the fingers (resistance: 1200 ohms) if you touch them to the terminals of a 6-volt battery? I 6/120 50mA 32Calculate the resistance of a filament in a light-bulb that carries 0.4A when 3.0 V is impressed across itR 3/0.4 33Calculate the current in a 140-W electric blanket connected to a 120-V outletP EI 140 120I I 140/120 .