(1) If the wire connection in the home circuit is not in good contact, it will often heat there and cause danger. Why 2. Xiao Li bought two incandescent bulbs, one marked with "20V 100W" and the other marked with "220V 15W". Can you judge which bulb to compete with 3. In order to save electricity, Xiao Hui wants to use two "220V 15W" light bulbs in series, and then connect them to the 220 V home circuit, and use them as aisle lights. Do you think this method is feasible? Can two light bulbs replace one light bulb really save electricity? Calculate the actual electric power of each light bulb in series 4. The working resistance of a refrigerator in Xiao Li's home is 20 ohm, and the working current is 0.5A. Can you estimate the electric power of this refrigerator

(1) If the wire connection in the home circuit is not in good contact, it will often heat there and cause danger. Why 2. Xiao Li bought two incandescent bulbs, one marked with "20V 100W" and the other marked with "220V 15W". Can you judge which bulb to compete with 3. In order to save electricity, Xiao Hui wants to use two "220V 15W" light bulbs in series, and then connect them to the 220 V home circuit, and use them as aisle lights. Do you think this method is feasible? Can two light bulbs replace one light bulb really save electricity? Calculate the actual electric power of each light bulb in series 4. The working resistance of a refrigerator in Xiao Li's home is 20 ohm, and the working current is 0.5A. Can you estimate the electric power of this refrigerator

1: If the wire connection is not well contacted, it will generate heat at the contact point because of the high contact resistance
20V 100W
3 can not save electricity. But it can extend the life of the bulb. The actual power of each bulb is 7.5w. after series connection.
The formula is: power = square of current x resistance

In home circuit, the junction of wires is more likely to generate heat, accelerate aging and even cause fire?

Answer: in the home circuit, the resistance of the place where the wires are connected to each other is large due to poor contact. The ∵ wire connection is connected in series with the wires in the circuit. The ∵ current passing through is equal and the power on time is equal. The ∵ q = i2rt, ∵ heat generated at the connection is more easily heated than that elsewhere, accelerating the aging of the wires and even causing fire

What's the difference between a home circuit and a general circuit made up of wires

Generally speaking, the home circuit is much more complex than the test circuit. All appliances and sockets in the home circuit are in parallel, and the switch on the trunk road is commonly known as the main switch

In home circuits, the junction of wires tends to heat up more easily and age faster than other places
A. The current at the connection is larger B. the current at the connection is smaller C. the resistance at the connection is larger D. the resistance at the connection is smaller

In the home circuit, the resistance of the wire connection is large because of poor contact. The ∵ wire connection is connected in series with the wire in the circuit. The ∵ current passing through is equal and the power on time is equal. The ∵ q = i2rt, ∵ heat generated at the connection is more likely to heat up than other places, and even cause fire