The emf and the internal resistance of a battery are as shown in the figure. If a current of 5 a is drawn from the battery when a resistor r is connected across the terminals a and b of the battery, what is the voltage drop across the resistor r?.

the gas collects in coils that then becomes a liquid that then flows through the coils inside the refrigerator

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg