Resistance IN Series & Parallel

The unit consists of 2 meters - one Voltmeter of 10V & another Milliammeter of 150 mA. Three resistance R1, R2 & R3 (of the order of 50 ohms each) connected in series. Voltmeter 10V is mounted in cabinet with their independent sockets. Milliammeter of 150mA is connected in series with all the three resistances & external input terminals. Built in DC regulated power supply of 10V, 500mA.