PH 122 Lecture Notes - Electric Catfish, Electric Eel, Bundesautobahn 60
Document Summary
A 60 w and a 100 w bulb are connected in series. Think about the current in the circuit, and through each bulb. The energy used by a circuit is supplied by the emf of the battery through a series of energy transformations. Echem (chemical energy in the battery) uelec (potential energy of separated charges) k (kinetic energy of moving charges) eth (thermal energy of atoms in the resistor) The battery supplies power at the rate pemf = i . The resistor dissipates power at the rate pr = i vr = i2r = ( v r)2. Suppose a stereo speaker (with a resistance of 8 ) uses a power of 20 watts. An electric eel may have 6,000 electrolytes connected in series. Each can produce a voltage of 150 mv. What total voltage could the eel produce? (there are losses; observed voltages are less than this. )
