1.The resistance of a bagel toaster is 14 ohm. To prepare abagel, the toaster is

Question

1.The resistance of a bagel toaster is 14 ohm. To prepare abagel, the toaster is operated for one minute from a 120- Voutlet. How much energy is delivered to the toaster? 2.The current in a 47-ohm resistor is .12A. This resistor isin series with a 28-ohm resistor, and the series combination isconnected across a battery. What is the battery voltage? Thanks in advance 1.The resistance of a bagel toaster is 14 ohm. To prepare abagel, the toaster is operated for one minute from a 120- Voutlet. How much energy is delivered to the toaster? 2.The current in a 47-ohm resistor is .12A. This resistor isin series with a 28-ohm resistor, and the series combination isconnected across a battery. What is the battery voltage? Thanks in advance

Explanation / Answer

1 ) Resistance R   = 14 ,time t = 1 min                                                        = 60 s           Voltage V   = 120 V     Energy    = Power *time                   = V2 / R * t                    = ( 120 V )2 / 14 * 60 s                    = 6.17*104 J 2 ) Resistance R1   =47 , R2   = 28        which are connected inseries Req    = R1 +R2                                                                  =47 + 28                                                                  = 75            Current in the circuit is   i = 0.12A           According to Ohm'slaw   V   = i * R                                                      = 0.12 A * 75                                                       =9 V

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