You are serving as a panel member at an aerospace conference. You must explain to a general audience how the AC current varies across a 20 W resistor. Find the expression for the corresponding current across the resistor given the following voltages: 2000 sin 100t 80sin(200t + 45 deg) 2cos(omega*t + 10 deg) - 20sin(omega't + 40 deg) Provide to the audience system examples where AC circuits are critical to aerospace operations