Which, if any, of these statements are true? (more than one may be true.) explain your choice or choices.
a. a battery supplies energy to a circuit.
b. a battery is a source of potential difference.
c. the potential difference between the terminals of the battery is always the same.
d. a battery is a source of current.
e. the current leaving the battery is always the same.

The following statement are true

A. A battery supplies energy to a circuit.

   It convert chemical energy to electrical energy by the using of electrodes.

B. A battery is a source of potential difference.

      It contains voltage difference between  terminals.

C. The potential difference between the terminals of the battery is always the same.

Battery is a source of voltage not current.

The current leaving from the battery depends on the resistance.

this means that the temperature of both substances will be equal

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.