electricity

Question 1

what are the 2 types of current flow

Answer 1

electron flow

conventional current

Question 2

what is the name of the charged particles that flow from a cell through resistors

Answer 2

electrons

Question 3

if the current in a 20 ohm resistor is 0.6a how much is in the resistor with 10 ohms.

Answer 3

0.6A

Question 4

how do you work out that the charge delivered by the battery in one minute is 36C

Answer 4

0.6A × 60s

= 36 C

Question 5

if 2 resistors 10 ohms and 20 ohms are connected in series across a battery and the current in the larger resistor is 0.6A. show that the voltage is 18V.

Answer 5

Total resistance = 30 Ω

0.6 × 30 = 18 V

Question 6

if 2 identical resistors are connected in parallel across a battery with a combined resistance of 12 ohms what is each resistors resistance.

Answer 6

24 Ω

Question 7

if 2 identical resistors are connected in series across a battery with a combined resistance of 12 ohms what is each resistors resistance.

Answer 7

6 Ω.

Question 8

3 resistors are connected in parallel with each other x is before that and after that there is a resistor connected in series and y is after that. x has a current of 3mA and the voltage between x and y is 12mV.
what is the total resistance between x and y.
what is the current in each resistor.
what is the voltage across each resistor.
what is the resistance of each resistor.

Answer 8

a. 0.012 V/ 0.003 A
= 4 Ω
b. so each of the
three parallel resistors takes a current of 1 mA.
Current in the resistor nearest Y is 3 mA.
c. Voltage across each parallel resistor = 1
4 of total voltage
= 1
4 × 12 mV
= 3 mV
Voltage across resistor nearest Y = 12 – 3
= 9 mV
d. 0.009V
0.003A
= 3 Ω Resistors are all identical – each is 3 Ω.