20km every 1 hr is what 20km/hr means.
so 3hrs is 20km*3=60km.
Answer:
= 54,000 Joules or 54 kJ
Explanation:
Electrical energy is given by the formula;
E = VIt; where V is the potential difference in volts, I is the current and t is the time in seconds.
Therefore;
Electrical energy = 120 V × 0.50 A × 15 ×60 seconds
= 54,000 Joules
Thus; the electrical energy is 54,000 joules or 54 kJ
Temperature is a measure of the average kinetic energy of the particles of a substance.
Hope this helps! :)