A source of e.m.f. of 15 V supplies a current of 2 A for six minutes. How much energy is provided in this time?

Sure, here's how to calculate the energy provided:

Step 1: Understand the formula The energy (E) provided by a source of electromotive force (emf) can be calculated using the formula E = VIt, where V is the voltage (in volts), I is the current (in amperes), and t is the time (in seconds).

Step 2: Convert time to seconds The time given is in minutes, so we need to convert it to seconds. There are 60 seconds in a minute, so 6 minutes is 6 * 60 = 360 seconds.

Step 3: Substitute the values into the formula Now we can substitute the values into the formula: E = VIt E = 15V * 2A * 360s

Step 4: Calculate the energy Multiplying these values together gives: E = 10800 Joules

So, the source of emf provides 10800 Joules of energy in six minutes.