what is the common range of resistivity of home appliances?
2007-01-29 22:21:59 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Remember voltage = current times resistance (V = IR, or R = V/I). Also, power equals current times voltage (P = IV, or I = P/V) . All household voltage is 110 volts. So you can figure out how much resistance an appliance has by knowing its power requirement. For example, a 60-watt light bulb would require a current of (I = 60 watts / 110 volts), or 0.5454 amps. Therefore, the resistance of the bulb would be R = V/I = 110 volts / 0.5454 amps = 202 ohms. For a 1200 watt hairdryer, the same technique yields a resistance of 10 ohms.
2007-01-29 22:54:25 · answer #1 · answered by Grizzly B 3 · 0⤊ 1⤋
The answer is under 15 amps for current which is 8 ohms of restivity. Note that the 15 amp breaker forces you to use no more than 15 amps. So the range would be no less than 8 and greater than 8 ohms.
The 8 ohms comes from fact you have 15 amp breakers in the basement main box on the line and V=IR or R=120/15 =8
Most but not all, home appliances are on a 15 amp breaker off the main panel. Exception is the plugs around the main counters(those are #12 wire and are 20 amp breakers on NEW house wiring.) and the Dryer if electric just to mention examples.
2007-01-30 07:32:06 · answer #2 · answered by James M 6 · 0⤊ 0⤋