An electrical heating system consists of a heater coil and a resistor connected to a 28 V28\text{ V}28 V DC power supply. An ammeter in the circuit reads 1.6 A1.6\text{ A}1.6 A.
State the equation linking voltage, current, and resistance.
Calculate the voltage across the 6.0 Ω6.0\ \Omega6.0 Ω resistor.
Show that the voltage across the heater coil is about 18 V18\text{ V}18 V.
Calculate the energy transferred to the heater coil in 5.0 minutes5.0\text{ minutes}5.0 minutes.
The liquid is initially cool. Explain why the temperature of the liquid eventually reaches a steady constant value.
Resistors can be arranged differently to heat a plate. The diagram below shows two alternative designs, Layout Alpha and Layout Beta.
State which design represents a series circuit, and which represents a parallel circuit.
Describe the advantages and disadvantages of choosing Layout Alpha over Layout Beta for this heating system.
