P2.4 Current electricity

Question 1

What is static electricity?

Answer 1

charge held by and insulator or and insulated conductor

Question 2

What happens when you rub a polythene rod with a dry cloth?

Answer 2

it transfers electrons to the rod from the cloth

rod becomes negatively charged

Question 3

What happens when you rub a Perspex rod with a dry cloth?

Answer 3

transfers electrons to the cloth from the rod

rod becomes positively charged

Question 4

What is electrical current?

Answer 4

a flow of charge/charged particles - electrons

Question 5

What is resistance?

Answer 5

Resistance(ohms) = potential difference(volts) / current (amperes)

Question 6

What is the rule for resistance in a series circuit?

Answer 6

total resistance is equal to the sum of the resistance of each component

Question 7

What is the rule for resistance in a parallel circuit?

Answer 7

the resistor with the largest resistance will pass the smallest current

Question 8

What is the relationship between current and potential difference in a resistor?

Answer 8

current through a resistor is directly proportional to potential difference across the resistor