Two resistors are connected in parallel to a 12-volt battery. One resistor, R1, has a value of 18 ohms. The other resistor, R2, has a value of 9 ohms. The total current in the circuit is 2 amperes. A student wishes to measure the current through R1 and the potential difference across R2. Using the symbols below for a battery, an ammeter, a voltmeter, and resistors, draw and label a circuit diagram that will enable the student to make the desired measurements.