voltage and resistance

Question

1.  if you increase the voltage across a circuit but do not increase the resistance, what will happen?

 

a.  the number of amperes the ciruit is carrying will increase

b.  the number of amperes the circuit is carrying will decrease

c.  the number of ohms in the circuit will increase

d.  the difference in the potential energy at both ends of the circuit will decrease

 

2.  if you increase the resistance in a circuit but do not increse the voltage across the circuit, what will happen?

 

a.   the number of amperes  the circuit is carrying iwll increase

b.  the number of amperes the circuit is carrying will decrease

c.  the number of ohms in the circuit will decrease

d.  the difference in the potential energy at both ends of the circuit will increase

 

thanks

Answer 1

For the first question and according to Ohm's law we have 

V=I*R if V is increased and R is constant the current I (number of amperes) will increase. answer a

for the second question answer b we have

R=V/I if R is increased and V is constant I will decrease. answer b