According to McDonald's nutrition facts a provides kiloCalories of energy. (1 dietitian's calorie is 1000 physicist's calories.) A typical automobile lead-acid battery can supply 50 Ampere-hours at 12 Volts. We can compare these by converting the energy specifications to common units. The SI unit of energy is the Joule=1 Watt-second. One physicist's calorie is 4.2 Joules.
How many Joules are there in a ?
How many Joules are there in a car battery?
Which tastes better? :-)

Question

According to McDonald's nutrition facts a   provides   kiloCalories of energy. (1 dietitian's calorie is 1000 physicist's calories.) A typical automobile lead-acid battery can supply 50 Ampere-hours at 12 Volts. We can compare these by converting the energy specifications to common units. The SI unit of energy is the Joule=1 Watt-second. One physicist's calorie is 4.2 Joules. 
How many Joules are there in a  ? 
How many Joules are there in a car battery?
Which tastes better? :-)

anonymous · Answer

2.    p=vi
 p=voltage given * ampere given * 3600