The mean power dissipated in a resistor is 115 μW115\text{ }\mu\text{W}115 μW when the root mean square (rms) voltage across the resistor is 210 mV. What is the peak current in the resistor?
5.48×10−4 A5.48 \times 10^{-4}\text{ A}5.48×10−4 A
7.75×10−4 A7.75 \times 10^{-4}\text{ A}7.75×10−4 A
1.09×10−3 A1.09 \times 10^{-3}\text{ A}1.09×10−3 A
1.55×10−3 A1.55 \times 10^{-3}\text{ A}1.55×10−3 A
66 exam-style questions on AQA A Level Physics Magnetic fields (A-level only), covering Magnetic flux density (A-level only), Moving charges in a magnetic field (A-level only), Magnetic flux and flux linkage (A-level only), Electromagnetic induction (A-level only), Alternating currents (A-level only), and The operation of a transformer (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.