Electric Circuits

Question 1

what are the main features of a parallel circuit

Answer 1

-voltage across each branch is the same
-total current is the sum of currents in each branch
-total resistance of all resistors less than resistance of smallest individual resistor

Question 2

what are the main features of a series circuit

Answer 2

-same current throughout
-total P.D. of power supply shared across components
-total resistance is the sum of resistance of each component

Question 3

what happens to resistance of a light-dependant resistor (LDR) when light intensity increases

Answer 3

resistance decreases

Question 4

what happens to the resistance of a thermistor as temperature increases

Answer 4

resistance decreases

Question 5

what happens to the resistance of a filament lamp as the tempetaure increases

Answer 5

resistance increases

Question 6

what 2 factors does current depend on and what are the units

Answer 6

resistance (ohm- Ω)
P.D. (volt-V)

Question 7

what is an ohmic conductor

Answer 7

a conductor where the current is directly proportional to voltage so resistance is constant (constant temperature)

Question 8

what are the units of:
-charge
-current
-time

Answer 8

-coulomb
-ampere
-second

Question 9

what is electric current

Answer 9

rate of flow of charge

Question 10

what is an electric field

Answer 10

a region of space around a charged object in which another charged object with experience and electrostatic force

Question 11

what will 2 objects carrying the same type of charge do if brought together

Answer 11

repel