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(a) (i) Which of these is a source of direct current (d.c.)? Put a cross (X) in the box next to your answer - Edexcel - GCSE Physics - Question 1 - 2016 - Paper 1
Question 1
(a) (i) Which of these is a source of direct current (d.c.)? Put a cross (X) in the box next to your answer. A battery B a light-dependent resistor (LDR) C a therm... show full transcript
Worked Solution & Example Answer:(a) (i) Which of these is a source of direct current (d.c.)? Put a cross (X) in the box next to your answer - Edexcel - GCSE Physics - Question 1 - 2016 - Paper 1
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Explain what is meant by a direct current (d.c.)
Answer
Direct current (d.c.) refers to the continuous flow of electric charge in a single direction. In d.c., the voltage remains constant over time, differentiating it from alternating current (a.c.), where the direction of flow periodically reverses. Examples of d.c. sources include batteries and solar cells.