Three resistors, all made of the same material, are connected in a circuit as shown. Resistor 1 has resistance 
 25.0 Ω . Resistor 2 has the same length as resistor 1, but half the cross-sectional area, while resistor 3 has the same area, but half the length. The circuit is connected to a 4.1 V battery. Find the current the flows through resistor 1 in A.