Page 134 - Physics Form 5 KSSM_Neat

3.4 Electrical Energy and Power

KEMENTERIAN PENDIDIKAN MALAYSIA

Photograph 3.6 Various electrical appliances at home
Photograph 3.6 shows various electrical appliances that are used at home. Electrical appliances
convert electrical energy into other forms of energy. For example, lamps produce light and heat
energy when supplied with electrical energy. Can you state the form of energy that is generated
by the electrical appliances in Photograph 3.6?
The Relationship between Electrical Energy (E), Voltage (V), Current (I) and
Time (t)

Based on the formula of potential difference, V = E
Q
where V = potential difference
E = electrical energy Info GALLERY
Q = the amount of charge flowing
1 J is the electrical energy that is
Electrical energy, E = VQ and Q = It used when 1 A of current flows
through an electrical device with a
Therefore, the relationship between E, V, I and t can be potential difference of 1 V across
formulated as: it for 1 s.
E = VIt

The S.I. unit for electrical energy, E is joule (J).

124 LS 3.4.1