Question No. 
Answers  key to symbols: x = multiply, 2 = to the power of, / = divide

Q1 
R = V / I = 230 / 15 = 15.33 Ohms 
Q2 
I = V / R = 230 / 60 = 3.83 Amps 
Q3 
V = I x R = 25 x 12 = 300 Volts 
Q4 
I = V / R = 200 / 400 = 0.5 Amps 
Q5 
V = I x R = 3 x 60 = 180 volts
and
P = V x I = 180 x 3 = 540 Watts
or
P = I2R = 32 x 60 = 540 Watts

Q6 
P = V x I = 230 x 7 = 1610 Watts 
Q7 
V = P / I = 4500 / 10 = 450 Volts
and
R = V / I = 450 / 10 = 45 Ohms
or
R = P / I2 = 4500 / 102 = 45 Ohms

Q8 
Diagram 3 
Q9 
Current is directly proportional to voltage 
Q10 
High resistance causes low current 
Q11 
Current flow is the movement of electrons 
Q12 
Current is inversely proportional to resistance 