5.2 Heating Effect of Electric Currents

Identify two features of the circuit shown.

Electrons moving through a metal wire transfer some of their electric potential energy to the positive ions of the metal. Which two changes are caused by this energy transfer?

Two identical 10 Ω resistors are connected first in series, and then in parallel, as shown.

Determine the correct combined resistance of each arrangement.

Select the graph which best describes the I-V characteristic of an ohmic resistor.

A wire with resistivity ρ, length L and cross-sectional area A has resistance R.

Which of the wire, made from the same material, will also have resistance R?

Which of the following statements are benefits of using parallel circuits when connecting components in homes and vehicles?

1. A single power source supplies all lights and appliances with the same potential difference 
2. The current is the same in all branches so only one type of fuse is needed
3. If one bulb breaks, the appliances in other branches continue to work

A student is provided with three identical cells, each having a potential difference of V.

For the two arrangements shown, what is the total potential difference across the array?

	Series	Parallel
A.
B.
C.
D.

A particular quantity X is an important factor when calculating for electrical circuits. X can be found using several different equations, as shown.

Which option identifies X?

Potential divider circuits are used to control outputs that are often changed, such as volume and brightness. For the potential divider circuit shown, identify the output voltage, V_out in terms of the input voltage, V_in.