Question

2. What happens if the key in the circuit is left open?
(i) Mention two differences between resistance and resistivity.
(ii)All the electric appliances in a household circuit are connected in parallel. Why​

Answer 1

Answer:

Explanation:

What happens if the key in the circuit is left open?

So when a series circuit is open, movements of electrons are stopped which case the circuit to remain dead. All the components on that circuit would not function.

(i)Mention two differences between resistance and resistivity.

Resistance

>SI unit is OHM (.)

>The resistance of a conductor depends on its length and area of the cross section

Resistivity

>SI unit is OHM meter (m)

>The resistance of a conductor depends on its length and area of the cross section

(ii)All the electric appliances in a household circuit are connected in parallel. Why​?

When appliances are connected in a parallel arrangement, each of them can be put on and off independently. This is a feature that is essential in a house's wiring. Also, if the appliances were wired in series, the potential difference across each appliance would vary depending on the resistance of the appliance