Use the information in the table about four different electric circuits to answer the question.
Circuit Resistance (ohms) Voltage (V)
1 0.5 20
2 0.5 40
3 0.25 40
4 0.25 60
Which circuit will have the greatest electric current?
(1 point)
Responses
circuit 2
circuit 4
circuit 1
circuit 3
circuit 4
why?
The electric current is given by the equation I = V/R, where I is the current, V is the voltage, and R is the resistance. The circuit with the lowest resistance will have the greatest current (assuming the same voltage).
In this case, circuit 4 has the lowest resistance of 0.25 ohms, and it also has a higher voltage of 60 volts compared to circuit 1's voltage of 20 volts. Therefore, circuit 4 will have the greatest electric current.
Circuit A has a resistance of 7.5 ohms, and circuit B has a resistance of 5 ohms. Which statement about the circuits must be correct?(1 point)
Responses
If the current in circuit A is equal to the current in circuit B, then the voltage in circuit A is less than the voltage in circuit B.
If the current in circuit A is equal to the current in circuit B, then the voltage in circuit A is less than the voltage in circuit B.
If the current in circuit A is less than the current in circuit B, then the voltage in circuit A is less than the voltage in circuit B.
If the current in circuit A is less than the current in circuit B, then the voltage in circuit A is less than the voltage in circuit B.
If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is less than the current in circuit B.
If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is less than the current in circuit B.
If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is equal to the current in circuit B.
If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is less than the current in circuit B.
Which statement best defines the resistance of an electric circuit?(1 point)
Responses
It describes how much electrical energy passes in a circuit.
It describes how much electrical energy passes in a circuit.
It is the measurement of the rate of electrical energy in a circuit.
It is the measurement of the rate of electrical energy in a circuit.
It limits the amount of electrical energy that can pass through a circuit.
It limits the amount of electrical energy that can pass through a circuit.
It is the amount of electrical energy that is available in a circuit.
It limits the amount of electrical energy that can pass through a circuit.
An electric circuit has an expected current of 80 amps. An electrician measures the current in the circuit at 120 amps. Which statement provides a possible explanation for this observation?(1 point)
Responses
A resistor in the circuit is broken.
A resistor in the circuit is broken.
The circuit has an extra resistor.
The circuit has an extra resistor.
There is not enough electrical energy in the circuit.
There is not enough electrical energy in the circuit.
There is not enough voltage in the circuit.
There is not enough voltage in the circuit.
To determine which circuit will have the greatest electric current, we need to use Ohm's Law, which states that current (I) equals voltage (V) divided by resistance (R), represented by the equation:
I = V / R
We can calculate the current for each circuit using this formula:
For Circuit 1:
I1 = 20V / 0.5Ω = 40A
For Circuit 2:
I2 = 40V / 0.5Ω = 80A
For Circuit 3:
I3 = 40V / 0.25Ω = 160A
For Circuit 4:
I4 = 60V / 0.25Ω = 240A
Based on these calculations, we can see that Circuit 4 will have the greatest electric current with a value of 240A. So the correct answer is "circuit 4".