Exercises basics Electrics

How does the power behave when the resistance is halved?

The power remains the same

The power is halved

The power doubles

The power is squared

The power triples

At a power resistor with 10 Ω a power of 5 W is converted. What power is converted when the applied voltage is doubled?

7,25 W

20 W

15 W

5 W

10 W

Which statement about the circuit below is correct?

Resistors – Mixed connections

The current through R4 is half the current through R3

The current through R3 is twice the current through R2

The current through R3 is twice the current through R4

The currents through R1 and R4 are equal

The current through R2 is half the current through R4.

Which statement agrees with the resistance curves shown below?

Resistors curves

R2 > R1

R3 < R2

R1 = R2

R2 > R3

R1 > R3

Resistors of different sizes are connected in parallel. Which statement is correct?

The total resistance is equal to the sum of the single resistances

The total resistance is bigger than the smallest single resistance

The largest partial current flows through the smallest single resistor

The current in the entire circuit is the same

The total voltage is equal to the sum of the individual voltages