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**[SOLVED] electrostatic physics?**

## Homework Statement

a cabin contains only two small electrical appliances: a radio that requires 10 milliamperes of current at 9 volts and a clock that requires 20 milliamperes at 15 volts, a 15 volt battery with negligible internal resistance supples the electrical energy to operate the radio and the clock

Calculate the resistance and calculate the electrical energy that must be supplied by the battery to operate the circuits for 1 minute

## Homework Equations

R= I/V and energy= (power)(t) and power = V x I

## The Attempt at a Solution

I know that the second appliance needs 9V, so you need to drop 6V across the resistor (15-9).

does that mean i plug in 9 for V to find R? then I equals 10 milliamperes which i multiply by 10^-3 to convert to amperes

and i totally don't get the second part