Final answer:
The electric heater with a power of 2kW has a greater resistance than the toaster with a power of 1kW.
Step-by-step explanation:
The resistance of a device can be calculated using Ohm's law, which states that resistance is equal to the voltage across the device divided by the current flowing through it. Since power is equal to voltage multiplied by current, we can rearrange the formula to find resistance: resistance is equal to power divided by current squared.
In this case, the power of the toaster is 1kW, which means it uses 1,000 watts. The power of the electric heater is 2kW, which means it uses 2,000 watts.
Assuming both the toaster and electric heater are connected to the same voltage source, the one with greater power will have a lower resistance. Therefore, the electric heater with a power of 2kW has a greater resistance than the toaster with a power of 1kW.
Out of a toaster of 1kW and an electric heater of 2kW, the one with the greater resistance is the toaster. This is explained by using the formula for electrical power, P = V^2 / R, where P is power in watts, V is voltage in volts, and R is resistance in ohms.
Assuming both the toaster and the heater are connected to the same voltage supply, we can infer that because the power used by the heater is greater, its resistance must be lower, whereas the toaster uses less power and thus has a higher resistance when both are connected to a common voltage source.